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Relevant bibliographies by topics / EPR spectral measurements

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Academic literature on the topic 'EPR spectral measurements'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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Journal articles on the topic "EPR spectral measurements"

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Gafurov, Marat R., Andrey A. Ponomarev, Georgiy V. Mamin, et al. "Application of pulsed and high-frequency electron paramagnetic resonance techniques to study petroleum disperse systems." Georesursy 22, no. 4 (2020): 2–14. http://dx.doi.org/10.18599/grs.2020.4.2-14.

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The spectral and relaxation characteristics of “free” organic radicals (FR) and vanadyl-porphyrin (VP) complexes in various petroleum disperse systems (PDS) like bitumen, petroleum, their high-molecular components and solutions were studied using stationary (conventional) and pulsed electron paramagnetic resonance (EPR) techniques in two frequency ranges (X- and W-bands, with the microwave radiation frequencies of about 9 GHz and 95 GHz, respectively). The features of the pulsed approaches (electron spin echo, modulation of the electron spin echo signal decay, electronic relaxation times) and

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Bansal, Usha, Samta Goyal, and Swati Agrawal. "Synthesis and Spectral Characterization of Mn(II) and Co(II) Complexes with Tetradentate Macrocyclic Ligand." Asian Journal of Chemistry 33, no. 9 (2021): 2207–11. http://dx.doi.org/10.14233/ajchem.2021.23275.

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Manganese(II) and cobalt(II) complexes were synthesized with [N4] tetradentate macrocyclic ligand using different metal salts i.e. MnCl2, Mn(NO3)2, CoCl2 and Co(NCS)2. The ligand was prepared by condensation of glyoxal and carbahydrazide. All these were characterized by elemental analysis, molar conductance measurements, magnetic moment, IR, mass, electronic and EPR spectral studies. Elemental analysis indicates that the complexes have composition MLX2 where (X = Cl–, NO3 –,NCS–). All the complexes were found to be non-electrolytic in nature so can be formulated as [MLX2]. Infrared spectra of

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Umendra, Komar, and Chandra Sulekh. "A study on the mononuclear bivalent manganese and copper complexes of twelve membered hexaaza [N6] macrocyclic ligand : Synthesis, spectral and in vitro antifungal screening." Journal of Indian Chemical Society Vol. 88, May 2011 (2011): 647–52. https://doi.org/10.5281/zenodo.5769010.

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Department of Chemistry, J. V. College (C. C. S. University, Meerut), Baraut (Baghpat), Uttar Pradesh, India <em>E-mail</em> : umendra_khokhar@rediffmail.com Department of Chemistry, Zakir Husain College (University of Delhi), J.L.N. Marg, New Delhi-110 002, India <em>E-mail</em> : schandra_00@yahoo.com <em>Manuscript received 21 January 2010, revised 06 May 2010, accepted 06 September 2010</em> New manganese(ll) and copper(II) complexes of 12-membered macrocyclic Schiff base ligand containing thiosemicarbazone moiety have been prepared having general composition IMLX2I where M = Mn<sup>II</su

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Gudasi, Kalagouda, Siddappa Patil, Ramesh Vadavi, Rashmi Shenoy, and Manjula Patil. "Synthesis and spectral studies of Cu(II), Ni(II), Co(II), Mn(II), Zn(II) and Cd(II) complexes of a new macroacyclic ligand n,n’-bis(2-benzothiazolyl)-2,6-pyridinedicarboxamide." Journal of the Serbian Chemical Society 71, no. 5 (2006): 529–42. http://dx.doi.org/10.2298/jsc0605529g.

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A new macroacyclic amide ligand N,N?-bis(2-benzothiazolyl)-2,6-pyridinedicarboxamide (BPD), formed by the condensation of 2,6-pyridinedicarbonyldichloride with 2-aminobenzothiazole and its Cu(II), Ni(II), Co(II), Mn(II), Zn(II) and Cd(II) complexes were synthesized. Their structures were elucidated on the basis of elemental analyses, conductance measurements, magnetic moments, spectral (IR, NMR UV-Visible, EPR and FAB) and thermal studies. The complexes exhibit an octahedral geometry around the metal center. Conductance data of the complexes suggested them to be 1:1 electrolytes. The pentadent

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Antuzevics, A., A. Fedotovs, and U. Rogulis. "Epr Spectrum Angular Dependences In Liyf4 Crystal / Epr Spektru Leņķiskās Atkarības Liyf4 Kristālā." Latvian Journal of Physics and Technical Sciences 49, no. 6-I (2012): 49–54. http://dx.doi.org/10.2478/v10047-012-0034-0.

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Abstract Electron paramagnetic resonance (EPR) measurements have been made for two perpendicular planes in a LiYF4 crystal before and after x-ray irradiation at room temperature. Analysis of the EPR spectrum angular dependence shows the presence of two defects - an impurity ion, which was embedded during the crystal growth process, and an x-ray induced defect with the g-factor of approx. 2.0. Spectral parameters and possible defect models are discussed.

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Kowalkowska-Zedler, Daria, Natalia Nedelko, Katarzyna Kazimierczuk, et al. "Novel tetrahedral cobalt(ii) silanethiolates: structures and magnetism." RSC Advances 10, no. 49 (2020): 29100–29108. http://dx.doi.org/10.1039/d0ra06036d.

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Structural, spectral and thermal properties of three tetrahedral Co(ii) silanethiolates were established by XRD, FTIR for solid samples and TGA. The magnetic properties were investigated by static magnetic measurements and X-band EPR spectroscopy.

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Weil, John A., and Brian C. S. Wong. "Energy-level crossing of atomic hydrogen spin states." Canadian Journal of Physics 88, no. 12 (2010): 947–49. http://dx.doi.org/10.1139/p10-075.

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Atomic hydrogen 1H0 has four spin states. It is not well known that the upper two, in its electronic ground state, cross at a sufficiently high externally applied magnetic field Bx (ca. 17 T). The magnetic resonance spectra show particular effects in the crossing region. In the present work, we predict the relevant field-swept spectra at selected fixed frequencies, for 1H0 encapsulated in crystalline alpha-quartz powder, using the known spin Hamiltonian parameters derived from single-crystal EPR measurements. It was found that there is a 5 GHz frequency region in which spectral effects from th

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Anitha, C., C. D. Sheela, P. Tharmaraj, and R. Shanmugakala. "Studies on Synthesis and Spectral Characterization of Some Transition Metal Complexes of Azo-Azomethine Derivative of Diaminomaleonitrile." International Journal of Inorganic Chemistry 2013 (January 16, 2013): 1–10. http://dx.doi.org/10.1155/2013/436275.

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New complexes of 2,3-bis(5-(4-chlorophenyl)diazenyl)-2-hydroxybenzylideneamino)maleonitrile (CDHBDMN) with VO(II), Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) were synthesized and characterized by analytical and physicochemical techniques, that is, elemental analyses, molar conductivity, UV, IR, EPR, 1H-NMR spectra, magnetic susceptibility and also by aid of scanning electron microscopy (SEM), nonlinear optical study (NLO), fluorescence spectral studies, and solvatochromic behaviors. Electronic and magnetic susceptibility measurements of the complexes indicate square pyramidal geometry for VO(I

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Wackerbarth, Ines, Ni Nyoman Agnes Tri Widhyadnyani, Simon Schmitz, et al. "CuII Complexes and Coordination Polymers with Pyridine or Pyrazine Amides and Amino Benzamides—Structures and EPR Patterns." Inorganics 8, no. 12 (2020): 65. http://dx.doi.org/10.3390/inorganics8120065.

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Isonicotine amide, picoline amide, pyrazine 2-amide, 2- and 4-amino benzamides and various CuII salts were used to target CuII complexes of these ligands alongside with 1D and 2D coordination polymers. Under the criterion of obtaining crystalline and single phased materials a number of new compounds were reliably reproduced. Remarkably, for some of these compounds the ideal Cu:ligand ratio of the starting materials turned out to be very different from Cu:ligand ratio in the products. Crystal and molecular structures from single-crystal XRD were obtained for all new compounds; phase purity was

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Charitos, Alexander, Vassilis Tangoulis, John Parthenios, et al. "Monitoring of Fe(II) Spin Transition in Cu(II)-Doped Spin-Crossover Nanoparticles." Molecules 30, no. 6 (2025): 1258. https://doi.org/10.3390/molecules30061258.

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Experimental protocols based on Electron Paramagnetic Resonance (EPR) and Raman spectroscopy are presented for the investigation of the Fe(II) spin transition in Cu(II)-doped 1-D spin-crossover (SCO) nanoparticles of the type [Fe1−xCux(NH2trz)3]Br2 where x = 0.03 and 0.06 and NH2trz = 4-amino-1, 2, 4-triazole. The resulting nanoparticles were characterized using Transmission Electron Microscopy (TEM), Infrared (IR) spectroscopy, and powder X-ray diffraction (p-XRD). Magnetic susceptibility measurements revealed a dependence on the scan rate, with critical temperatures and hysteresis widths var

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Dissertations / Theses on the topic "EPR spectral measurements"

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Roller, Robert Stephen. "The determination of the Forster critical radius through time-dependent fluorescence decay measurements and the spectral overlap method." 2004. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=81012&T=F.

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Vollrath, Ian E. Trischuk William (supervisor). "Measurement of the W boson mass at the Collider Detector at Fermilab from a fit to the transverse momentum spectrum of the muon." 2007. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=478975&T=F.

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Books on the topic "EPR spectral measurements"

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Das, Utpal. EPR and photochemical studies of solids: I. Diazofluorene photochemistry in single crystals. II. Measurement and simulation of the EPR powder spectra of organic free radicals. 1986.

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Book chapters on the topic "EPR spectral measurements"

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Hustedt, Eric J., and Albert H. Beth. "Structural Information from CW-EPR Spectra of Dipolar Coupled Nitroxide Spin Labels." In Distance Measurements in Biological Systems by EPR. Springer US, 2002. http://dx.doi.org/10.1007/0-306-47109-4_3.

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Huang, Yunwei, Dengfu Chen, Lin Bai, Mujun Long, Kui Lv, and Pei Xu. "Study on the Infrared Spectral Range for Radiation Temperature Measurement of Continuous Casting Slab." In EPD Congress 2016. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48111-1_17.

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Huang, Yunwei, Chen Dengfu, Mujun Long, Lv Kui, and Xu Pei. "Study on the Infrared Spectral Range for Radiation Temperature Measurement of Continuous Casting Slab." In 2016 EPD Congress. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119274742.ch17.

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Chechik, Victor, Emma Carter, and Damien Murphy. "Linewidth of EPR spectra." In Electron Paramagnetic Resonance. Oxford University Press, 2016. http://dx.doi.org/10.1093/hesc/9780198727606.003.0008.

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This chapter highlights the importance of linewidth as a parameter in electron paramagnetic resonance (EPR) spectroscopy, describing narrow lines that are saturated or distorted if incorrect spectrometer parameters are chosen. It describes broad lines as difficult to distinguish from the background, particularly if the intensity is not very high. It also analyses linewidth measurements that provide important information about the structure and dynamics of the spin system. The chapter looks at a few important relaxation mechanisms that contribute to the linewidth. It illustrates how it is not p

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Chechik, Victor, Emma Carter, and Damien Murphy. "Transition metal ions and inorganic radicals." In Electron Paramagnetic Resonance. Oxford University Press, 2016. http://dx.doi.org/10.1093/hesc/9780198727606.003.0006.

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This chapter describes transition metal ions (TMI) as isolated dopants in a solid matrix that coordinates an organic ligand in a metal complex. It analyses the unpaired electron confined to metal-based d-orbitals. It also looks at the key difference between the electron paramagnetic resonance (EPR) spectra of TMIs compared to organic radicals, noting that EPR exhibit large anisotropic g values which are no longer close to ge. The chapter presents the EPR linewidths which are often larger compared to organic radicals due to the short relaxation times. It explains why low temperature measurement

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"Effect of 24.5 MeV 14N ion irradiation on the EPR spectra and luminescent properties of R3Al5O12:Ce (R=Lu, Y, Tb) single crystalline films scintillators." In Book of Abstracts - RAD 2025 Conference. RAD Centre, Niš, Serbia, 2025. https://doi.org/10.21175/rad.abstr.book.2025.30.2.

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In the last three decades, the Сe3+ doped A3B5O12 (A=Lu, Gd, Y, Tb; B=Al, Ga) garnets have become important scintillation and dosimetric materials. Nowadays, the garnets in the different crystalline forms (crystals, single crystalline films (SCF), ceramics, micro- and nanopowders) are considered as excellent luminescent transformers of various types of ionization radiations (α- and β- particles, electrons and neutrons, and X and γ-quanta) into emission in the broad spectral range. However, the scintillation figure-of-merit of different functional forms of garnets significantly depend on the pr

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Nizovtsev Alexander P., Kilin Sergei Ya., Pushkarchuk Alexander L., Pushkarchuk Vadim A., and Kuten Semen A. "Spin-Hamiltonian analysis of quantum registers on single NV center and proximal." In NATO Science for Peace and Security Series - D: Information and Communication Security. IOS Press, 2010. https://doi.org/10.3233/978-1-60750-547-1-148.

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Spin systems consisting of a single electronic spin of the NV center in diamond and few proximal13C nuclei spins which are considered now as a candidate for a room-temperature implementation of a quantum computer register with optical access are studied by spin-Hamiltonian method using parameters of hyperfine NV-13C interactions taken from EPR measurements on NV ensemble and from ab initio (DFT) simulation of carbon clusters containing NV centers. Experimental data on ODMR spectra and spin echo modulation obtained on single NV+n13C centers are interpreted without fitting parameters.

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Kuroda-Sowa, Takayoshi, and Motohiro Nakano. "ESR Spectroscopy." In Instrumental Analysis of Coordination Compounds. Royal Society of Chemistry, 2024. http://dx.doi.org/10.1039/9781837674992-00057.

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First of all, the basic principles of ESR including the Zeeman effect and the selection rules for hydrogen atoms are described. ESR instruments and measurement methods for solution and solid samples including radical generation methods are also described. In order to evaluate unpaired electron density on s, p, or d orbitals from the observed ESR spectrum, the spin Hamiltonian including the g-tensor, D-tensor, and spin–orbit coupling is discussed in detail. Finally, ESR applications in modern cutting-edge research including high-field electron paramagnetic resonance (HF-EPR) are described.

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Orchard, A. F. "Paramagnetism – part II Compounds of the transition elements." In Magnetochemistry. Oxford University Press, 2003. http://dx.doi.org/10.1093/hesc/9780198792789.003.0005.

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This chapter deals with transition metals. These form an enormous variety of compounds and display a remarkable diversity of magnetic properties. It looks at paramagnetic phases and subtle aspects of paramagnetic behaviour, which provides a rich source of information about electronic structure. It also recounts the crucial role of the contemplation of paramagnetic properties in the development of ideas concerning the electronic structures of transition metal compounds, which formed the basis of the ligand field theory. The chapter discusses the importance of magnetic measurements of susceptibi

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Schweiger, Arthur, and Gunnar Jeschke. "Relaxation and related phenomena." In Principles of Pulse Electron Paramagnetic Resonance. Oxford University PressOxford, 2001. http://dx.doi.org/10.1093/oso/9780198506348.003.0008.

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Abstract Relaxation of coherence and polarization limits the measuring time and thus the resolution of pulse EPR experiments, but is also a source of information on the electronic structure and, in particular, on molecular and lattice dynamics. In this chapter we first provide an overview of the most important processes which cause a decay of the signal (§8.1). True relaxation processes which lead to an irreversible loss of magnetization are distinguished from those processes which merely transfer magnetization to other parts of the spectrum or to other paramagnetic species. We discuss the mos

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Conference papers on the topic "EPR spectral measurements"

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Podarov, R. A., M. I. Kolokolov, V. E. Tretyakov, M. V. Fedin, and O. A. Krumkacheva. "DIPOLAR EPR SPECTROSCOPY OF FULLERENE AND PORPHYRIN SYMMETRIC PAIRS." In XI МЕЖДУНАРОДНАЯ КОНФЕРЕНЦИЯ МОЛОДЫХ УЧЕНЫХ: БИОИНФОРМАТИКОВ, БИОТЕХНОЛОГОВ, БИОФИЗИКОВ, ВИРУСОЛОГОВ, МОЛЕКУЛЯРНЫХ БИОЛОГОВ И СПЕЦИАЛИСТОВ ФУНДАМЕНТАЛЬНОЙ МЕДИЦИНЫ. IPC NSU, 2024. https://doi.org/10.25205/978-5-4437-1691-6-132.

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This work introduces a dipole electron paramagnetic resonance (EPR) approach for measuring distances in symmetric non-orthogonal photoexcited spin pairs, aiming to enhance sensitivity of pulsed EPR techniques. Using fullerene and porphyrin-based pairs, the study explores intermolecular distances, spectral features, proposing a methodology for nanometer-scale distance measurements in such systems with potential applications in biological contexts.

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Johnston, Paul. "Spectral Mismatch Correlated With Air Mass Under Varying Clear Sky Conditions for Photovoltaic Facilities With Crystalline-Silicon Modules: Solar Spectral Effects — An EPC Contractor’s Perspective." In ASME 2014 Power Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/power2014-32200.

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Photovoltaic utility-scale grid-connected power generation facilities have performance guarantee bases that often include a reference solar spectrum. EPC contractors are obligated to correct tested performance for solar spectrum, as is done for irradiance and cell temperature, to judge whether contractual performance guarantees have been satisfied. Air mass correlated with solar spectral irradiance offers a convenient way of accomplishing this. This paper offers an improvement in the versatility and accuracy of accounting for spectral effects in this manner. The effects on the spectral composi

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Gupta, Sreenath B., Bipin Bihari, Munidhar Biruduganti, and Raj Sekar. "In-Cylinder Equivalence Ratio Measurements in a EGR Equipped Engine." In ASME 2010 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/icef2010-35072.

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A single-cylinder natural gas fueled engine equipped with a Exhaust Gas Recirculation (EGR) system was ignited using a laser. The broadband emission from the spark kernel was spectrally resolved and the peaks corresponding to Hα, N and O atoms were measured for a range of conditions with global equivalence ratios ranging between 0.6 and 1.0, and for Exhaust Gas Recirculation fractions up to 29%. The (Hα/O) and (Hα/N) peak intensity ratios from the spectral scans correlated extremely well (R2 > 0.97) with local oxygen based equivalence ratios. Appropriate relations were developed to relate s

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Pereira, Silvania F., K. C. Peng, and H. J. Kimble. "Quantum correlations of quadrature amplitudes in nondegenerate parametric downconversion." In OSA Annual Meeting. Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.thii1.

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For measurements describable by a discrete set of possibilities, numerous demonstrations of the violation of Bell's inequalities have been reported in optical physics based on observations of polarization correlations for photon pairs. By contrast for observables with a continuous spectrum, there appears to be no general inequalities corresponding to those of Bell and no experimental realization of the original Einstein-Podolsky-Rosen paradox. Following Reid and Drummond,1 we are attempting to demonstrate the EPR paradox in the context of the measurement of continuous quantum variables with a

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Genuit, Klaus, and Wade Bray. "Dynamic Acoustic Measurement Techniques Considering Human Perception." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14717.

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Dynamic measurement implies determining the content of signals having spectral structure and energy changing with time, sometimes on very short time scales. Dynamic measurements can present challenges to determine sufficient information in both the time and frequency domains. High resolution in frequency prevents finding short-term peak levels and recognizing true crest factors, and vice versa. If the dynamic measurement concerns sound, the much better simultaneous recognition of time and frequency information by the ear/brain than by conventional measurement methods can further complicate the

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Kelly, Shaina, Ron J. M. Bonnie, Micheal J. Dick, and Dragan Veselinovic. "NMR WETTABILITY INDEX MEASUREMENTS AND METHODS COMPARED ON A VARIETY OF UNCONVENTIONAL SAMPLES." In 2021 SPWLA 62nd Annual Logging Symposium Online. Society of Petrophysicists and Well Log Analysts, 2021. http://dx.doi.org/10.30632/spwla-2021-0096.

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Matrix wettability is a key driver in relative permeability and, hence, a critical factor controlling imbibition and drainage at UR fracture-matrix interfaces as well as enhanced oil recovery (EOR). In this study, we (1) adapt and apply the NMR-based wettability index (NWI) methodology of Looyestijn et al. (2006) to a variety of unconventional twin samples undergoing, respectively, spontaneous imbibition with oil-displacing-water and water-displacing-oil and (2) compare the robustness of this method among a variety of samples pairs and also to other NMR-based wettability methods. The samples a

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Aldina, G. J., and Jeffrey L. Hahn. "Validation Study of FTIR-Based Emissions Measurements at a Municipal Waste Combustor." In 13th Annual North American Waste-to-Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/nawtec13-3158.

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EPA Test Methods 301 and 320 include statistical techniques for validating sampling methods in specific gas matrices. Several of these techniques were used to analyze extractive FTIR data collected at a municipal solid waste incinerator and to validate the method for hydrogen chloride (HCl) measurements. FTIR results for carbon monoxide (CO), sulfur dioxide (SO2), and nitric oxide (NO) were also compared to measurements recorded by the facility’s continuous emissions monitors (CEMs). Presented are discussions of the equipment, spectral analyses, and statistical comparisons of the various test

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Gonzalez, Miguel, Tim Thiel, Nathan St. Michel, et al. "A New Viscosity Sensing Platform for the Assessment of Polymer Degradation in EOR Polymer Fluids." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210014-ms.

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Abstract Polymer degradation during Enhanced Oil Recovery (EOR) can have large impact on recovery rates during polymer flooding. In the field, few practical solutions exist to perform quality control/assurance (QA/QC) on EOR polymer fluids at surface and no solutions exist for measurements downhole. Here, we present the development of a miniaturized sensor that can be used to detect the onset of polymer degradation by measuring the viscous properties of EOR polymer fluids. The device was tested on samples collected from a polymer flooding operation. We describe its integration into wellsite po

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Broussard, J., and P. Crooker. "NRC/EPRI Residual Stress Validation Program Phase I: Experimental Specimen Modeling and Measurement." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57677.

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The US Nuclear Regulatory Commission (NRC) and the Electric Power Research Institute (EPRI) are working cooperatively under a memorandum of understanding to validate welding residual stress predictions in pressurized water reactor primary cooling loop components containing dissimilar metal welds. These stresses are of interest as DM welds in pressurized water reactors are susceptible to primary water stress corrosion cracking (PWSCC) and tensile weld residual stresses are one of the primary drivers of this stress corrosion cracking mechanism. The NRC/EPRI weld residual stress (WRS) program cur

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Iijima, Akira, and Hideo Shoji. "A Spectroscopic Analysis of Combustion in Homogeneous Charge Compression Ignition Engine." In ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference collocated with the ASME 2007 InterPACK Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ht2007-32552.

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The principal issues of Homogeneous Charge Compression Ignition (HCCI) combustion that must be addressed include ignition timing control and expansion of the stable operation region. Detailed analyses of ignition and combustion mechanisms must be undertaken to resolve these issues. In this study, spectroscopic technique was used to investigate the effects of the air-fuel ratio (AFR) and residual gas state on ignition and combustion characteristics. Spectroscopic measurement was made of light emission spectra. The results revealed that the distribution profile of the light emission intensity of

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