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Journal articles on the topic 'Doublet de Fermi'

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Published: 4 June 2021

Last updated: 10 February 2022

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1

Gale, G. M., P. Guyot-Sionnest, W. Q. Zheng, and C. Flytzanis. "Time-resolved nonlinear spectroscopy of a fermi doublet: The {ν1,2ν2} Fermi resonance inCO2solid." Physical Review Letters 54, no. 8 (February 25, 1985): 823–26. http://dx.doi.org/10.1103/physrevlett.54.823.

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2

Gale, G. M., P. Guyot-Sionnest, W. Q. Zheng, and C. Flytzanis. "Time-Resolved Nonlinear Spectroscopy of a Fermi Doublet: The{ν1, 2ν2}Fermi Resonance in CO2Solid." Physical Review Letters 54, no. 17 (April 29, 1985): 1965. http://dx.doi.org/10.1103/physrevlett.54.1965.2.

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3

Nyquist, Richard A., Sam E. Settineri, and Davin A. Luoma. "Infrared Study of Benzaldehyde and 4-Substituted Benzaldehydes in Carbon Tetrachloride and/or Chloroform Solutions: Aldehydic CH Group." Applied Spectroscopy 46, no. 2 (February 1992): 293–305. http://dx.doi.org/10.1366/0003702924125582.

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The vCH and 2 δCH Fermi resonance doublet and unperturbed vCH and unperturbed 2 δCH for 4- x-benzaldehydes increase in frequency as the mole % CHCl3/CCl4 increases. One portion of the vCH and 2 δCH Fermi doublet occurs in the region 2726–2746 cm−1 and the other portion of the Fermi doublet occurs in the region 2805–2845 cm−1. The unperturbed vCH for 4- x-benzaldehydes is assigned in the region 2760–2810 cm−1. Submaxima are also noted for 4- x-benzaldehydes in the region 2726–2810 cm−1 and these bands are assigned to combination tones. The vasym. NO2 mode occurs in the region 1533.60–1538.73 cm−1 and the vsym. NO2 mode occurs in the region 1344.07–1345.63 cm−1 for 4-nitrobenzalde-hyde in CHCl3/CCl4 solutions. The vsym. NO2 mode shifts to lower frequency by ∼4.8 cm−1, while the vsym. NO2 mode shifts to higher frequency by ∼1.6 cm−1 in going from CCl4 solution to CHCl3 solution. The vCN mode for 4-cyanobenzaldehyde increases in frequency in a nonlinear manner as the mole % CHCl3/CCl4 increases. The vOH mode for 4-hydroxybenzaldehyde decreases in frequency in essentially a linear manner as the mole % CHCl3/CCl4 increases. The δCH mode for 4- x-benzaldehydes increases in frequency as the mole % CHCl3/CCl4 increases; however, neither unperturbed vCH nor δCH correlates with Hammett σp values.

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4

Brooker, Murray H., and Nanping Wen. "Raman studies of cyanate: Fermi resonance, hydration and hydrolysis to urea." Canadian Journal of Chemistry 71, no. 10 (October 1, 1993): 1764–73. http://dx.doi.org/10.1139/v93-219.

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Raman spectra were measured for potassium cyanate in the solid phase and as aqueous solutions in H2O and D2O for freshly prepared and for aged solutions. The results indicated that the assignment of the Fermi doublet, ν1 and 2ν2, for solid potassium cyanate was reversed from the assignment for the aqueous solution. The Fermi doublet has an associated pair of hot bands at 1191 and 1315 cm−1 which originate from the 638 cm−1 ν2 state, 010. Assignment of the hot bands was confirmed by studies of solid potassium cyanate at liquid-N2 temperature, room temperature, and at 473 K. Raman spectra of aged aqueous potassium cyanate revealed that the cyanate ion hydrolyzed slowly and spontaneously at room temperature (even without added ammonium) to produce urea and a carbamate, carbonate equilibrium mixture in parallel reactions. Hydrolysis of cyanate in aqueous ammonium chloride solution resulted in almost total conversion of cyanate to urea. The reaction was not reversible under ambient conditions. Differences in peak frequencies and half-widths were observed for the cyanate dissolved in H2O compared to solutions in D2O. The results provide evidence for strong hydrogen bonding of cyanate to water and are consistent with greater structure in the D2O solution. Theoretical ab initio calculations indicated that the water molecules hydrogen bond well at both the oxygen and nitrogen atoms of cyanate although the hydrogen bond to nitrogen was found to be slightly stronger.

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5

Shimizu, Y., O. Sakai, and S. Suzuki. "Non-Fermi-liquid behavior of impurity Anderson model with non-Kramers doublet ground state." Physica B: Condensed Matter 259-261 (January 1999): 366–67. http://dx.doi.org/10.1016/s0921-4526(98)00646-2.

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6

Zerda, T. W., X. Song, and J. Jonas. "Raman Study of Intermolecular Interactions in Supercritical Solutions of Naphthalene in CO2." Applied Spectroscopy 40, no. 8 (November 1986): 1194–99. http://dx.doi.org/10.1366/0003702864507657.

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The high-pressure Raman spectra of the v1 and 2 v2 Fermi doublet of CO2 and the C-H stretching, C-H bending and C-C-C breathing modes of naphthalene have been studied at pressures varying up to 2000 bar and temperatures between 60 and 90°C. The naphthalene bands show a blue frequency shift with increasing density, whereas a red shift for the Fermi resonance free stretching mode of CO2 is observed with increasing density. The blue shift is explained in terms of repulsive interactions probed by the naphthalene vibrations, while the red shift is related to the attractive forces dominating in the intermolecular potential as seen by the CO2 stretching mode. The experimental results support the validity of the site-to-site model of intermolecular potential. The intermolecular potential between naphthalene and CO2 is assumed to be anisotropic, and the proposed electrostatic quadrupole-quadrupole model of these interactions effectively explains the anisotropy in the intermolecular potential, the energy of association, and the frequency shifts.

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7

LALAK, ZYGMUNT, BURT A. OVRUT, and STEVEN THOMAS. "ANTISYMMETRIC TENSOR FIELD COUPLED TO CHIRAL MATTER AND DYNAMICAL SYMMETRY BREAKING." Modern Physics Letters A 07, no. 07 (March 7, 1992): 571–82. http://dx.doi.org/10.1142/s0217732392000549.

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The minimal coupling of chiral fermions to a second rank antisymmetric tensor field is considered, and an alternative to the standard model is discussed in which the Higgs doublet is replaced by a real scalar and a second rank antisymmetric tensor. The dynamical breaking of electroweak symmetry, via the Nambu-Jona-Lasinio mechanism, is shown to occur due to natural four-Fermi interactions. The mean field theory due to instanton configurations in the antisymmetric tensor field is also presented and possible cosmological applications of this model are discussed.

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8

Bertrán, José Fernández, Boris La Serna Torres, Denis Fernández Félix, and Boris Lokshin. "Assignment of the forbidden level of the Fermi doublet in the Raman spectrum of CH2Br2." Journal of Raman Spectroscopy 19, no. 1 (February 1988): 33–35. http://dx.doi.org/10.1002/jrs.1250190106.

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9

Steger, E., K. Herzog, and A. Flegl. "A computer-based ivestigation into the Fermi resonance doublet in the Raman spectrum of benzene." Spectrochimica Acta Part A: Molecular Spectroscopy 41, no. 6 (January 1985): 869–70. http://dx.doi.org/10.1016/0584-8539(85)80036-2.

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10

Vigasin, A. A. "Intensity and Bandshapes of Collision-Induced Absorption by CO2 in the Region of the Fermi Doublet." Journal of Molecular Spectroscopy 200, no. 1 (March 2000): 89–95. http://dx.doi.org/10.1006/jmsp.1999.8022.

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11

Li, Dong-Fei, Shu-Qin Gao, Cheng-Lin Sun, Xiu-Lan Jiang, and Zuo-Wei Li. "The effect of the Fermi resonance on the Raman scattering cross sections of the Fermi doublet ν1 and 2ν2 of liquid carbon disulfide in benzene." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 89 (April 2012): 155–59. http://dx.doi.org/10.1016/j.saa.2011.12.038.

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12

Li, Dong-Fei, Shu-Qin Gao, Cheng-Lin Sun, and Zuo-Wei Li. "The effect of an anti-hydrogen bond on Fermi resonance: A Raman spectroscopic study of the Fermi doublet ν 1 −ν 12 of liquid pyridine." Chinese Physics B 21, no. 8 (August 2012): 083301. http://dx.doi.org/10.1088/1674-1056/21/8/083301.

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13

Bartholomew, Richard J., and Donald E. Irish. "Raman spectral studies of solutions at elevated temperatures and pressures.13. Sodium formate – water." Canadian Journal of Chemistry 71, no. 10 (October 1, 1993): 1728–33. http://dx.doi.org/10.1139/v93-215.

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Raman spectra of the formate anion in water (H2O and D2O) have been measured for four concentrations under ambient conditions and for two concentrations at temperatures ranging from 49 to 239 °C and a pressure of 10 MPa. Five of the six fundamental modes of vibration are polarized. This result is inconsistent with C2ν symmetry. The Fermi resonance doublet clearly results from the interaction of 2ν5 and ν1. The latter mode decreases in frequency as the temperature rises, thus increasing the coupling and hence the intensity of the 2ν5 component. The coupling constant, W, and the positions of the unperturbed bands [Formula: see text] and [Formula: see text] have been calculated. No evidence to support a bifurcated structure for the solvated anion was found.

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14

Horiuchi, Shunsaku, Oscar Macias, Diego Restrepo, Andrés Rivera, Oscar Zapata, and Hamish Silverwood. "The Fermi-LAT gamma-ray excess at the Galactic Center in the singlet-doublet fermion dark matter model." Journal of Cosmology and Astroparticle Physics 2016, no. 03 (March 29, 2016): 048. http://dx.doi.org/10.1088/1475-7516/2016/03/048.

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15

Eisenberg, Azaria Solomon, and Laura J. Juszczak. "Correlation of TrpGly and GlyTrp Rotamer Structure with W7 and W10 UV Resonance Raman Modes and Fluorescence Emission Shifts." Journal of Amino Acids 2012 (July 22, 2012): 1–10. http://dx.doi.org/10.1155/2012/735076.

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Tryptophyl glycine (TrpGly) and glycyl tryptophan (GlyTrp) dipeptides at pH 5.5 and pH 9.3 show a pattern of fluorescence emission shifts with the TrpGly zwitterion emission solely blue shifted. This pattern is matched by shifts in the UV resonance Raman (UVRR) W10 band position and the W7 Fermi doublet band ratio. Ab initio calculations show that the 1340 cm−1 band of the W7 doublet is composed of three modes, two of which determine the W7 band ratios for the dipeptides. Molecular dynamics simulations show that the dipeptides take on two conformations: one with the peptide backbone extended; one with the backbone curled over the indole. The dihedral angle critical to these conformations is χ1 and takes on three discrete values. Only the TrpGly zwitterion spends an appreciable amount of time in the extended backbone conformation as this is stabilized by two hydrogen bonds with the terminal amine cation. According to a Stark effect model, a positive charge near the pyrrole keeps the 1La transition at high energy, limiting fluorescence emission red shift, as observed for the TrpGly zwitterion. The hydrogen bond stabilized backbone provides a rationale for the Cmethylene-Cα-Ccarbonyl W10 symmetric stretch that is unique to the TrpGly zwitterion.

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16

Li, Dong-Fei, Xiu-Lan Jiang, Biao Cao, Zuo-Wei Li, Shu-Qin Gao, Mi Zhou, Zhi-Wei Men, and Nai-Cui Zhai. "Study of asymmetric wavenumber shift of the Fermi doublet ν1 − 2ν2 in the Raman spectrum of liquid carbon disulfide." Journal of Raman Spectroscopy 41, no. 7 (October 6, 2009): 776–79. http://dx.doi.org/10.1002/jrs.2510.

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17

Modak, Kamakshya Prasad, and Debasish Majumdar. "CONFRONTING GALACTIC AND EXTRAGALACTIC γ -RAYS OBSERVED BY FERMI -LAT WITH ANNIHILATING DARK MATTER IN AN INERT HIGGS DOUBLET MODEL." Astrophysical Journal Supplement Series 219, no. 2 (August 24, 2015): 37. http://dx.doi.org/10.1088/0067-0049/219/2/37.

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18

Hou, George Wei-Shu. "Links between flavor and electroweak symmetry breaking." International Journal of Modern Physics A 29, no. 21 (August 20, 2014): 1444007. http://dx.doi.org/10.1142/s0217751x14440072.

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Fermion mass generation in the standard model was invented by Weinberg, while it is an old notion that strong Yukawa coupling could be the agent of electroweak symmetry breaking. Observation of the 126 GeV boson has crashed the prospects for such a heavy chiral quark doublet Q. However, the dilaton possibility can only be ruled out by confirming vector boson fusion with Run 2 data at the LHC, which starts only in 2015. We recast the [Formula: see text] condensation scenario as Fermi–Yang model v2.0. A Gap Equation has been constructed, with numerical solution demonstrating dynamical mQ generation; scale invariance of this equation may be consistent with a dilaton. Other consequences to be checked are [Formula: see text] "annihilation stars," and enhanced Bd →μ+μ-, KL →π0νν, and possibly sin ϕs. If verified in Nature, the Agent of BEH mechanism would differ from current perception, the 126 GeV boson would be the first New Physics at the LHC, and we would have enough CP violation for baryogenesis.

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19

Zhu, Lei, Scott A. Hewitt, and George W. Flynn. "Quantum interference effects on the collisional excitation of the Fermi doublet states of CO2 by hot electrons and hot H(D) atoms." Journal of Chemical Physics 94, no. 5 (March 1991): 4088–90. http://dx.doi.org/10.1063/1.460637.

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20

Vigasin, A. A., E. G. Tarakanova, and G. V. Tchlenova. "IR-spectra of (CO2)2 dimers and collision-induced absorption of carbon dioxide in the region of the fermi doublet (ν1, 2ν2)." Journal of Quantitative Spectroscopy and Radiative Transfer 50, no. 6 (December 1993): 695–703. http://dx.doi.org/10.1016/0022-4073(93)90035-g.

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21

Garrabos, Y., M. A. Echargui, and F. Marsault‐Herail. "Comparison between the density effects on the levels of the Raman spectra of the Fermi resonance doublet of the 12C16O2 and 13C16O2 molecules." Journal of Chemical Physics 91, no. 10 (November 15, 1989): 5869–81. http://dx.doi.org/10.1063/1.457455.

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22

Choudhary, Renu, Rana Biswas, Bicai Pan, and Durga Paudyal. "Defects in SiC for Quantum Computing." MRS Advances 4, no. 40 (2019): 2217–22. http://dx.doi.org/10.1557/adv.2019.301.

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AbstractMany novel materials are being actively considered for quantum information science and for realizing high-performance qubit operation at room temperature. It is known that deep defects in wide-band gap semiconductors can have spin states and long coherence times suitable for qubit operation. We theoretically investigate from ab-initio density functional theory (DFT) that the defect states in the hexagonal silicon carbide (4H-SiC) are potential qubit materials. The DFT supercell calculations were performed with the local-orbital and pseudopotential methods including hybrid exchange-correlation functionals. Di-vacancies in SiC supercells yielded defect levels in the gap consisting of closely spaced doublet just above the valence band edge, and higher levels in the band gap. The divacancy with a spin state of 1 is charge neutral. The divacancy is characterized by C-dangling bonds and a Si-dangling bonds. Jahn-teller distortions and formation energies as a function of the Fermi level and single photon interactions with these defect levels will be discussed. In contrast, the anti-site defects where C, Si are interchanged have high formation energies of 5.4 eV and have just a single shallow defect level close to the valence band edge, with no spin. We will compare results including the defect levels from both the electronic structure approaches.

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23

Święch, Dominika, Gaetano Palumbo, Natalia Piergies, Ewa Pięta, Aleksandra Szkudlarek, and Czesława Paluszkiewicz. "Spectroscopic Investigations of 316L Stainless Steel under Simulated Inflammatory Conditions for Implant Applications: The Effect of Tryptophan as Corrosion Inhibitor/Hydrophobicity Marker." Coatings 11, no. 9 (September 11, 2021): 1097. http://dx.doi.org/10.3390/coatings11091097.

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In this paper, the conformational changes of tryptophan (Trp) on the corroded 316 L stainless steel (SS) surface obtained under controlled simulated inflammatory conditions have been studied by Raman (RS) and Fourier-transform infrared (FT-IR) spectroscopy methods. The corrosion behavior and protective efficiency of the investigated samples were performed using the potentiodynamic polarization (PDP) technique in phosphate-buffered saline (PBS) solution acidified to pH 3.0 at 37 °C in the presence and absence of 10−2 M Trp, with different immersion times (2 h and 24 h). The amino acid is adsorbed onto the corroded SS surface mainly through the lone electron pair of the nitrogen atom of the indole ring, which adopts a more/less tilted orientation, and the protonated amine group. The visible differences in the intensity of the Fermi doublet upon adsorption of Trp onto the corroded SS surface, which is a sensitive marker of the local environment, suggested that a stronger hydrophobic environment is observed. This may result in an improvement of the corrosion resistance, after 2 h than 24 h of exposure time. The electrochemical results confirm this statement—the inhibition efficiency of Trp, acting as a mixed-type inhibitor, is made drastically higher after a short period of immersion.

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24

Sharma, Shiv K., Anupam K. Misra, Samuel M. Clegg, James E. Barefield, Roger C. Wiens, and Tayro Acosta. "Time-resolved remote Raman study of minerals under supercritical CO 2 and high temperatures relevant to Venus exploration." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 368, no. 1922 (July 13, 2010): 3167–91. http://dx.doi.org/10.1098/rsta.2010.0034.

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We report time-resolved (TR) remote Raman spectra of minerals under supercritical CO 2 (approx. 95 atm pressure and 423 K) and under atmospheric pressure and high temperature up to 1003 K at distances of 1.5 and 9 m, respectively. The TR Raman spectra of hydrous and anhydrous sulphates, carbonate and silicate minerals (e.g. talc, olivine, pyroxenes and feldspars) under supercritical CO 2 (approx. 95 atm pressure and 423 K) clearly show the well-defined Raman fingerprints of each mineral along with the Fermi resonance doublet of CO 2 . Besides the CO 2 doublet and the effect of the viewing window, the main differences in the Raman spectra under Venus conditions are the phase transitions, the dehydration and decarbonation of various minerals, along with a slight shift in the peak positions and an increase in line-widths. The dehydration of melanterite (FeSO 4 · 7H 2 O) at 423 K under approximately 95 atm CO 2 is detected by the presence of the Raman fingerprints of rozenite (FeSO 4 · 4H 2 O) in the spectrum. Similarly, the high-temperature Raman spectra under ambient pressure of gypsum (CaSO 4 · 2H 2 O) and talc (Mg 3 Si 4 O 10 (OH) 2 ) indicate that gypsum dehydrates at 518 K, but talc remains stable up to 1003 K. Partial dissociation of dolomite (CaMg(CO 3 ) 2 ) is observed at 973 K. The TR remote Raman spectra of olivine, α-spodumene (LiAlSi 2 O 6 ) and clino-enstatite (MgSiO 3 ) pyroxenes and of albite (NaAlSi 3 O 8 ) and microcline (KAlSi 3 O 8 ) feldspars at high temperatures also show that the Raman lines remain sharp and well defined in the high-temperature spectra. The results of this study show that TR remote Raman spectroscopy could be a potential tool for exploring the surface mineralogy of Venus during both daytime and nighttime at short and long distances.

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25

Bertran, José Fernández, and Boris La Serna. "Study of the fermi doublet ν1-2ν2 in the Raman spectrum of liquid carbon disulphide by the solvent variation method and the modified winther method." Journal of Raman Spectroscopy 20, no. 7 (July 1989): 419–21. http://dx.doi.org/10.1002/jrs.1250200705.

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26

Rutkowski, K. S., S. M. Melikova, T. D. Kolomiitsova, N. N. Filippov, and A. Koll. "Infrared studies of CO2 doped Xe solutions in gas, liquid and solid phases. The fundamental ν3 band and the Coriolis perturbed Fermi doublet (ν1+ν21, ν1+ν211)." Journal of Molecular Structure 596, no. 1-3 (September 2001): 179–83. http://dx.doi.org/10.1016/s0022-2860(01)00711-6.

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27

Zhang, Liang, Wen Wen, XiaoDong Ma, and Ying Wang. "Super Efimovian expansions of superfluid Fermi gases in the BCS–BEC crossover." International Journal of Modern Physics B 32, no. 21 (August 6, 2018): 1850230. http://dx.doi.org/10.1142/s0217979218502302.

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We study the super Efimovian expansions of a superfluid Fermi gas in the crossover from Bardeen–Cooper–Schrieffer (BCS) superfluid to a Bose–Einstein condensate (BEC), by using superfluid hydrodynamic equations with the equation of state fitting from the experimental data and a scaling approach. We find that in an isotropic trap, the super Efimovian expansion of the Fermi superfluid in the unitary limit is characterized by the double-log periodicity, while for an axially symmetric trap, the double-log periodicity only emerges in the longer direction for a large anisotropy of the trapping frequencies. Away from unitarity where the scale invariance is broken, the super Efimovian expansions of the superfluid Fermi gases deviate from the double-log oscillations. The oscillations in the BCS regime deviate upward from the double-log oscillations, whereas the oscillations in the BEC regime deviate downward and the deviation in the BEC limit is the most significant. This difference can be used to discriminate different superfluid regimes.

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28

Akbari-Moghanjoughi, M. "Double-wells and double-layers in dusty Fermi–Dirac plasmas: Comparison with the semiclassical Thomas–Fermi counterpart." Physics of Plasmas 17, no. 12 (December 2010): 123709. http://dx.doi.org/10.1063/1.3527997.

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29

Angeloni, L., R. Righini, P. R. Salvi, and V. Schettino. "Relaxation dynamics of fermi doublets in CS2 crystals." Chemical Physics Letters 154, no. 5 (February 1989): 432–38. http://dx.doi.org/10.1016/0009-2614(89)87126-x.

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30

Allaria, E., L. Badano, S. Bassanese, F. Capotondi, D. Castronovo, P. Cinquegrana, M. B. Danailov, et al. "The FERMI free-electron lasers." Journal of Synchrotron Radiation 22, no. 3 (April 21, 2015): 485–91. http://dx.doi.org/10.1107/s1600577515005366.

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FERMI is a seeded free-electron laser (FEL) facility located at the Elettra laboratory in Trieste, Italy, and is now in user operation with its first FEL line, FEL-1, covering the wavelength range between 100 and 20 nm. The second FEL line, FEL-2, a high-gain harmonic generation double-stage cascade covering the wavelength range 20–4 nm, has also completed commissioning and the first user call has been recently opened. An overview of the typical operating modes of the facility is presented.

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31

Yang, Yihao, Hong-xiang Sun, Jian-ping Xia, Haoran Xue, Zhen Gao, Yong Ge, Ding Jia, Shou-qi Yuan, Yidong Chong, and Baile Zhang. "Topological triply degenerate point with double Fermi arcs." Nature Physics 15, no. 7 (April 22, 2019): 645–49. http://dx.doi.org/10.1038/s41567-019-0502-z.

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32

Tanatar, B., B. Renklioglu, and M. O. Oktel. "Drag Effect in Double-Layer Dipolar Fermi Gases." Journal of Physics: Conference Series 568, no. 1 (December 8, 2014): 012021. http://dx.doi.org/10.1088/1742-6596/568/1/012021.

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33

Pokotilo, Yurii M., Alla N. Petukh, Valentin V. Litvinov, and B. G. Tsvirko. "Hydrogen-Related Donors in Silicon: Centers with Negative Electronic Correlation Energy." Solid State Phenomena 108-109 (December 2005): 229–34. http://dx.doi.org/10.4028/www.scientific.net/ssp.108-109.229.

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The transformation of the shallow hydrogen-related donors, which have been formed in the silicon samples by irradiation of the low energy (300 keV) protons and following heat treatment under 350 0С or 450 0С was investigated. The experiment was carried out on Ag-Mo-Si Shottky diodes and diodes with shallow p+-n-junction. The concentration and distribution of these donors were defined by C-V-method at 1.2 MHz frequency. Using temperature dependence of equilibrium electron concentration it was established, that the hydrogen-related donors were charged controlled centers with negative electronic correlation energy (U<0). The transformation between both equilibrium configurations of the double hydrogen-related donor takes place when value of the Fermi level is arranged near Ec-0.30 eV. It was revealed that the donor transformation from neutral into double charged state have been stimulated by minority carriers trapping under room temperature when Fermi level was higher then level of the double electron occupation E(0/++)= Ec-0.30 eV.

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34

Hritzová, Oľga, and Dušan Koščík. "Intramolecular Hydrogen Bonds and Fermi Resonance in N-Substituted N'-(2-Fluorobenzoyl)thiourea Derivatives." Collection of Czechoslovak Chemical Communications 59, no. 4 (1994): 951–56. http://dx.doi.org/10.1135/cccc19940951.

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The presence of intramolecular NH...O=C bonds was proved in N-substituted N'-(2-fluorobenzoyl)thiourea derivatives by analysis of their infrared spectra. The intramolecular vibrational effects bring about a shift of the ν(NH) vibrational band to lower frequencies to the extent that the band gets into a vicinity to the δ(NH) overtone and Fermi resonance occurs between them. In addition, the ν(NH) vibration is also affected by Fermi resonance with the ν(CO) + δ(NH) combination. Double absorption bands were observed in the ν(CO) region for some of the derivatives. Based on perturbation theory applied to three-level interactions and using the Langseth and Lord equations, the band frequencies corrected for Fermi resonance were calculated and the hydrogen bond strength was examined in the compounds studied.

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35

Mehdipour, Hamid, Brendan A. Smith, Ali T. Rezakhani, Saeedeh S. Tafreshi, Nora H. de Leeuw, Oleg V. Prezhdo, Alireza Z. Moshfegh, and Alexey V. Akimov. "Dependence of electron transfer dynamics on the number of graphene layers in π-stacked 2D materials: insights from ab initio nonadiabatic molecular dynamics." Physical Chemistry Chemical Physics 21, no. 41 (2019): 23198–208. http://dx.doi.org/10.1039/c9cp04100a.

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Time-resolved simulation study has been carried out to explain anti-Fermi Golden rule order of charge transfer rates measured at the interfaces of Zn-phthalocyanine molecule with single-layer graphene and double-layer graphene.

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36

Zaharim, Wan Nurfadhilah, Shukri Sulaiman, Siti Nuramira Abu Bakar, Nur Eliana Ismail, Harison Rozak, and Isao Watanabe. "The Effects of Split Valence Basis Sets on Muon Hyperfine Interaction in Guanine Nucleobase and Nucleotide Structures." Materials Science Forum 966 (August 2019): 222–28. http://dx.doi.org/10.4028/www.scientific.net/msf.966.222.

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The DFT cluster method was employed to investigate the electronic structures and muonium hyperfine interactions in guanine nucleobase and nucleotide using three different basis sets. The total energy and Fermi contact values were calculated for muon trapped at carbon '8'. The three basis sets, 6-31G, 6-311G and 6-311G(d,p), were used in tandem with the B3LYP functional. There are significant quantitative differences in the calculated total energy. 6-311G(d,p) produced the lowest total energy as compared to the other basis sets. The lowering of the total energy is due to the increase in the number of basis functions to describe the atomic orbitals, which is consistent with the postulate on basis set completeness. The 6-31G basis set produced the muon Fermi contact value that is the closest to the experimental value. The calculated Fermi contact values for the nucleobase and nucleotide are significantly lowered in going from the double-zeta to the triple-zeta basis set by 5% and 4% respectively. The lowering of the Fermi contact value can be attributed to the extension of the triple-zeta basis set in describing the valence atomic orbitals. The presence of the sugar phosphate group in the nucleotide instead of the methyl group tends to lower the Fermi contact value. Thus, the sugar phosphate group should be taken into consideration when designing a calculation model.

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37

Zhao, Hongliang, Yu Guo, Shengnan Sun, Chenglin Sun, and Mi Zhou. "Double Fermi resonance: High pressure Raman investigations on hexachloroethane." Vibrational Spectroscopy 90 (May 2017): 63–68. http://dx.doi.org/10.1016/j.vibspec.2017.04.002.

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38

Ching, Cheng-Rui, Tso-Hsiu Ho, Bing-Song Zou, and Huan-Ching Chiang. "Nuclear Fermi motion effect on pion double charge exchange." Physics Letters B 252, no. 2 (December 1990): 192–97. http://dx.doi.org/10.1016/0370-2693(90)90860-9.

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39

CHENG, KAIJIA, and SHUYU CHENG. "STUDY ON THE MECHANISM OF THE CAPACITY." International Journal of Modern Physics B 21, no. 18n19 (July 30, 2007): 3078–81. http://dx.doi.org/10.1142/s0217979207043944.

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TFDC (Thomas-Fermi-Dirac-Cheng) electron theory is applied to analyzing the characteristics of the electrons inside the double layer of the nanometer composite thin films. This paper proposes the new mechanism about the high capacity in both theoretical analysis and experimental measurement.

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40

HUANG, XUGUANG, XUEWEN HAO, and PENGFEI ZHUANG. "ASYMMETRIC FERMI SUPERFLUID WITH TWO TYPES OF PAIRINGS." International Journal of Modern Physics E 16, no. 07n08 (August 2007): 2307–12. http://dx.doi.org/10.1142/s0218301307007854.

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We investigate the phase diagram in the plane of temperature and chemical potential mismatch for an asymmetric fermion superfluid with double- and single-species pairings. There is no mixing of these two types of pairings at fixed chemical potential, but the introduction of the single species pairing cures the magnetic instability at low temperature.

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41

TAKATSUKA, TATSUYUKI, and RYOZO TAMAGAKI. "ΛΣ− PAIRING IN “BUBBLE FERMI SHELL” SCHEME." Modern Physics Letters A 23, no. 27n30 (September 30, 2008): 2473–76. http://dx.doi.org/10.1142/s0217732308029617.

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In neutron star cores, superfluid state of hyperons such as lambda (Λ) and sigma-minus (Σ−) has been shown to realize by a realistic approach. This result importantly supports the idea of nonstandard fast “hyperon cooling” scenario to explain colder class neutron stars observed. However, a less attractive ΛΛ interaction suggested by a double Λ hypernucleus ([Formula: see text]; “NAGARA” event) leads to a disappearance of Λ superfluidity and thereby the breaking down of the scenario. In this connection, the revival of “Λ superfluidity” due to the ΛΣ− pairing, instead of ΛΛ one, is discussed in a new scheme of “bubble Fermi shell” hypothesis where the matching of two different Fermi surfaces is forced.

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42

TONG, NING-HUA, and SHUN-QING SHEN. "LOW TEMPERATURE PROPERTIES OF THE MOTT–HUBBARD TRANSITION." Modern Physics Letters B 15, no. 27 (November 20, 2001): 1249–58. http://dx.doi.org/10.1142/s0217984901003123.

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The unanalytical feature of the Mott–Hubbard metal-insulator transition in infinite dimensions is studied by using a modified self-consistency scheme in the framework of dynamical mean-field theory. For a specific low temperature T=0.0025W (W: half bandwidth), the "Z"-shaped or "S"-shaped curves for double occupancy D, energy per lattice site E, and the quasi-particle weight Z are obtained as functions of U. Direct observation shows that the Fermi-liquid phase changes to the insulating phase through a non-Fermi-liquid phase at the unstable level. Based on our results, a scenario of zero temperature MIT is proposed. The phase diagram for MIT on the T–D plane is also presented.

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43

Kargarian, Mehdi, Mohit Randeria, and Yuan-Ming Lu. "Are the surface Fermi arcs in Dirac semimetals topologically protected?" Proceedings of the National Academy of Sciences 113, no. 31 (July 19, 2016): 8648–52. http://dx.doi.org/10.1073/pnas.1524787113.

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Motivated by recent experiments probing anomalous surface states of Dirac semimetals (DSMs) Na3Bi and Cd3As2, we raise the question posed in the title. We find that, in marked contrast to Weyl semimetals, the gapless surface states of DSMs are not topologically protected in general, except on time-reversal-invariant planes of surface Brillouin zone. We first demonstrate this finding in a minimal four-band model with a pair of Dirac nodes at k=(0,0,±Q), where gapless states on the side surfaces are protected only near kz=0. We then validate our conclusions about the absence of a topological invariant protecting double Fermi arcs in DSMs, using a K-theory analysis for space groups of Na3Bi and Cd3As2. Generically, the arcs deform into a Fermi pocket, similar to the surface states of a topological insulator, and this pocket can merge into the projection of bulk Dirac Fermi surfaces as the chemical potential is varied. We make sharp predictions for the doping dependence of the surface states of a DSM that can be tested by angle-resolved photoemission spectroscopy and quantum oscillation experiments.

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Zang, Jun, David Schmeltzer, and Joseph L. Birman. "Optical Fermi edge singularity of double-layer quantum Hall systems." Physical Review Letters 71, no. 5 (August 2, 1993): 773–76. http://dx.doi.org/10.1103/physrevlett.71.773.

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45

Zhang, Tian, Zhongyun Ma, Linjun Wang, Jinyang Xi, and Zhigang Shuai. "Interface electronic structures of reversible double-docking self-assembled monolayers on an Au(111) surface." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372, no. 2013 (April 13, 2014): 20130018. http://dx.doi.org/10.1098/rsta.2013.0018.

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Double-docking self-assembled monolayers (DDSAMs), namely self-assembled monolayers (SAMs) formed by molecules possessing two docking groups, provide great flexibility to tune the work function of metal electrodes and the tunnelling barrier between metal electrodes and the SAMs, and thus offer promising applications in both organic and molecular electronics. Based on the dispersion-corrected density functional theory (DFT) in comparison with conventional DFT, we carry out a systematic investigation on the dual configurations of a series of DDSAMs on an Au(111) surface. Through analysing the interface electronic structures, we obtain the relationship between single molecular properties and the SAM-induced work-function modification as well as the level alignment between the metal Fermi level and molecular frontier states. The two possible conformations of one type of DDSAM on a metal surface reveal a strong difference in the work-function modification and the electron/hole tunnelling barriers. Fermi-level pinning is found to be a key factor to understand the interface electronic properties.

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46

CIVITARESE, O., S. J. LANDAU, and M. E. MOSQUERA. "DOUBLE BETA DECAY RATES AS TEST OF THE TIME VARIATION OF FUNDAMENTAL CONSTANTS." International Journal of Modern Physics E 17, no. 03 (March 2008): 493–504. http://dx.doi.org/10.1142/s0218301308009847.

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We study the effect of the variation of fundamental constants, extracted from cosmological models, upon double beta decay rates. It is found that, by assuming the variations of the fundamental constants with time, one may obtain corrections to the calculated values of the double beta decay rates, but only at earlier times. This effect is notorious for the case of a power-law time dependence of the fine structure constant α and of the Fermi constant GF. However, since these models do not predict any effect on today's decay rates, it is concluded that no significant new information may be extracted about them from current values of double beta decay observables.

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47

Pramana, Stevin S., Andrea Cavallaro, Cheng Li, Albertus D. Handoko, Kuang Wen Chan, Robert J. Walker, Anna Regoutz, et al. "Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites: oxygen evolution reaction and conductivity." Journal of Materials Chemistry A 6, no. 13 (2018): 5335–45. http://dx.doi.org/10.1039/c7ta06817d.

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Upon Sr-doping in GdBa_1−xSrxCo₂O_6−δ, a shift of the valence band maximum VB_max towards the Fermi energy E_F was observed leading to better OER activity.

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EZAWA, Z. F., and A. IWAZAKI. "DOUBLE-LAYER ANYON SUPERCONDUCTIVITY WITHOUT P AND T VIOLATION." Modern Physics Letters B 07, no. 02 (January 20, 1993): 109–16. http://dx.doi.org/10.1142/s021798499300014x.

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Anyon superconductivity is studied theoretically in a double-layer system containing identical anyons. In the mean-field approximation it is shown that the system possesses the superconducting phase due to the condensation of pairs of anyons belonging to different layers. There is no violation of P and T symmetry in this phase. The ground-state wavefunction derived exhibits these features. The gap energy is also calculated explicitly as ε F for semions, ε F being the fermi energy. The magnetic field is found to be squeezed into a vortex carrying one half of the Dirac unit of the magnetic flux.

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BLANN, MARSHALL. "JURASSIC (TRI) QUARK: AN ANGULAR DISTRIBUTION MODEL FOR HEAVY ION REACTIONS." International Journal of Modern Physics E 16, no. 04 (May 2007): 1065–71. http://dx.doi.org/10.1142/s0218301307006514.

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Double differential neutron emission spectra are calculated assuming initial directions and energies result from random angle coupling of beam energy and projectile Fermi momenta. Results are compared with data of Holub et al. for 300 MeV 12C+165Ho.The energy distributions resulting from the random angle assumption are compared with results of the exciton formula for A - 1 degrees of freedom, where A is the projectile mass number.

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50

Liu, Jinn-Liang, Dexuan Xie, and Bob Eisenberg. "Poisson-Fermi Formulation of Nonlocal Electrostatics in Electrolyte Solutions." Computational and Mathematical Biophysics 5, no. 1 (October 26, 2017): 116–24. http://dx.doi.org/10.1515/mlbmb-2017-0007.

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Abstract We present a nonlocal electrostatic formulation of nonuniform ions and water molecules with interstitial voids that uses a Fermi-like distribution to account for steric and correlation efects in electrolyte solutions. The formulation is based on the volume exclusion of hard spheres leading to a steric potential and Maxwell’s displacement field with Yukawa-type interactions resulting in a nonlocal electric potential. The classical Poisson-Boltzmann model fails to describe steric and correlation effects important in a variety of chemical and biological systems, especially in high field or large concentration conditions found in and near binding sites, ion channels, and electrodes. Steric effects and correlations are apparent when we compare nonlocal Poisson-Fermi results to Poisson-Boltzmann calculations in electric double layer and to experimental measurements on the selectivity of potassium channels for K+ over Na+.

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