Relevant bibliographies by topics / IONIZATON

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'IONIZATON'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'IONIZATON.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "IONIZATON"

1

Oda, Toshiatsu, Shinichi Namba, Ken Takiyama, and Utaro Furukane. "Fast Numerical Calculation for a Set of Nonlinear Rate Equations: Application to Rapid Ionizaton Phase in Plasma." Japanese Journal of Applied Physics 44, no. 11 (November 9, 2005): 8118–24. http://dx.doi.org/10.1143/jjap.44.8118.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Wiederholt, Erwin, Volker Fahrney, and Dorothea Behrens. "A modular apparatus for demonstrating gas chromatography using serial coupling of a thermal conductivity and flame ionizaton detector." Journal of Chemical Education 67, no. 2 (February 1990): 181. http://dx.doi.org/10.1021/ed067p181.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Manchado, A., F. Prada, L. Stanghellini, and N. Panagia. "Sub-arcsecond near-IR imaging and long-slit spectroscopy of NGC 7027." Symposium - International Astronomical Union 180 (1997): 256. http://dx.doi.org/10.1017/s0074180900130748.

Full text
Abstract:
We report sub-arcsecond narrow band imaging in the lines of H2 2.1218 μm, Brγ 2.16 μm, [Fe II] 1.664 μm of the Planetary Nebulae NGC 7027. Data were obtained at the 3.5 m telescope at Calar Alto Observatory (Spain), using MAGIC. A false color image was produced by combining these three narrow band images. Thus, and due to extraordinary seeing (0″.6 arcsecond) conditions, allow us to reveal the morphology of the excited molecular and ionized gas. The Brγ and the [Fe II] images allowed us to study the structure of the ionized gas at slightly different excitation levels, according to the ionization potentials of the ions involved in the corresponding transitions (13.6 eV to ionize hydrogen, versus 17.4 eV for iron ionizaton). Since NGC 7027 is a high excitation nebula, the iron is readily double– ionized in the hotter regions, thus what we really see in the [Fe II] image is the low–intermediate excitation zones. By studying the [Fe II] and Brγ images together we infer that: the (non–reddened) low–ionization gas morphology consists of a regular, smooth ring reminder of a projected cylindrical structure. In addition to a brightness level that is at least thirty times the brightness of the maximum [Fe II] emission, the ionized hydrogen image exhibit a strong brightness gradient between the mentioned ring and the outer regions, and the emission is comparatively negligible outside the ring–like feature of about 12 × 10 arcsec (the measures refer to the major and minor axes of the ellipse–like shape). The [Fe II] morphology is less so ring–like and regular, and it seems to indicate smaller scale structure, such as clumps and filaments, at the resolution scale–level. The dishomogeneity in the [Fe II] emission could be ascribed to gradients in the elemental distribution, as well (and more probably so) as to the plasma temperature and density inhomogeneities. The H2 molecular image completely embeds the ionized gas zones, up to a size of about 16 × 11 arcsec. The smaller size refers here to the waist of the markedly bipolar shape, similar to a projected peanut; the larger size is the dimension of the two main lobes. The highest brightness through the molecular filters corresponds to the inner ring, slightly less extended than the ionized one, and to an outer envelope that is not seen in the ionized gas, and has a maximum diagonal extension of about 24 arcsec. Spatially resolved low resolution spectra (R 200) were obtained in the H and K band.
APA, Harvard, Vancouver, ISO, and other styles
4

Afaneh, Feras, and Horst Schmidt-Böcking. "Imaging of strong field dissociative single and double ionization channels of N2O." International Journal of Modern Physics B 31, no. 29 (November 7, 2017): 1750215. http://dx.doi.org/10.1142/s0217979217502150.

Full text
Abstract:
In this paper, we study single and double ionizations of N2O in a short elliptically polarized 800 nm laser pulse using the COLTRIMS technique. The molecular-frame photoelectron angular distribution and the ion sum-momentum distribution of single and double ionizations of N2O molecules are reported for the single ionization dissociative channel NO[Formula: see text] + N and the double ionization dissociative channel NO[Formula: see text] + N[Formula: see text]. The ionizations of multiple orbitals for the two studied dissociative channels were identified via studying the orientation dependent ionization rates for their KERs. The results show that the shape of the ionizing orbitals governs the single and double ionization processes of N2O.
APA, Harvard, Vancouver, ISO, and other styles
5

Madunil, Siddihalu Lakshitha, Totaro Imasaka, and Tomoko Imasaka. "Resonant and non-resonant femtosecond ionization mass spectrometry of organochlorine pesticides." Analyst 145, no. 3 (2020): 777–83. http://dx.doi.org/10.1039/c9an01861a.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Muchall, Heidi M., and Nick H. Werstiuk. "Ionization potentials of nitriles — Photoelectron spectra of succinonitrile and glutaronitrile." Canadian Journal of Chemistry 84, no. 9 (September 1, 2006): 1124–31. http://dx.doi.org/10.1139/v06-141.

Full text
Abstract:
The He(I) photoelectron spectra of succinonitrile (1) and glutaronitrile (2), both with extensive overlap of ionization bands in the low-energy region, are reported. To assign ionizations, we studied the conformational behaviour and resulting ionization energy dependence of 1 and 2 computationally with the B3LYP/6-31+G(d) model chemistry based on the fact that it reliably reproduces the ionization potentials of eleven mono- and di-nitriles, both saturated and unsaturated. The correlation of proton affinities with observed ionization potentials of 1, 2, and malononitrile establishes the orbital sequence of four C≡N π orbitals followed by two nitrogen lone pair orbitals as the highest occupied molecular orbitals for all three compounds.Key words: photoelectron spectrum, ionization potential, conformational dependence, nitrile, DFT.
APA, Harvard, Vancouver, ISO, and other styles
7

Fowe, Emmanuel Penka, and André Dieter Bandrauk. "Nonlinear time-dependent density functional theory studies of the ionization of CO2 by ultrashort intense laser pulses." Canadian Journal of Chemistry 87, no. 7 (July 2009): 1081–89. http://dx.doi.org/10.1139/v09-074.

Full text
Abstract:
Time-dependent density functional theory (TDDFT) studies of the ionization of CO2 by intense laser pulses (3.50 × 1014, 1.40 × 1015, 2.99 × 1015, and 1.25 × 1016 W/cm2) at 800 nm (ω = 0.0584 au) are presented in the nonlinear nonpertubative regime. Special emphasis is placed on elucidating molecular orbital orientation and various peak-intensities effects on the ionization processes. The results reveal that molecular orbital ionizations are strongly sensitive to their symmetry and the laser intensities. Most notably, we found that with a proper choice of the laser intensity (3.5 × 1014 W/cm2), the sensitivity is strong enough such that the nature and symmetry of the highest occupied molecular orbital (HOMO) can be directly probed and visualized from the angular dependence of laser-induced ionization. At higher intensities, ionization is found to occur also from inner orbitals, thus complicating the imaging of simple orbitals. A time-dependent electron-localization function (TDELF) is used to get a visual insight on the time evolution process of the electron density.
APA, Harvard, Vancouver, ISO, and other styles
8

Bartnik, Andrzej, Wojciech Skrzeczanowski, Henryk Fiedorowicz, Przemysław Wachulak, Tomasz Fok, Łukasz Węgrzyński, and Roman Jarocki. "Photoionized plasmas induced in molecular gases by extreme ultraviolet and X-ray pulses." EPJ Web of Conferences 167 (2018): 03003. http://dx.doi.org/10.1051/epjconf/201816703003.

Full text
Abstract:
In this work a laser-produced plasma (LPP) source was used to create low temperature plasmas. An extreme ultraviolet and soft X-ray (EUV/SXR) radiation pulse was used for ionization of molecular gases, injected into a vacuum chamber synchronously with the EUV/SXR pulse. Energies of photons exceeding 100 eV were sufficient for dissociative ionization, ionization of atoms or even ions. The resulting photoelectrons had also enough energy for further ionizations or excitations. Time resolved UV/VIS spectra, corresponding to single charged ions, molecules and molecular ions, were recorded. For spectral lines, corresponding to radiative transitions in F II and S II ions, electron temperature was calculated based on a Boltzmann plot method. Numerical simulations of the molecular spectra were fitted to the experimental spectra allowing for determination of vibrational and rotational temperatures.
APA, Harvard, Vancouver, ISO, and other styles
9

Mah, K. R., F. W. Dalby, and C. W. Barnard. "Polarization dependence of resonant multiphoton ionizations on 1S0 and 1,3D2 states in atomic mercury." Canadian Journal of Physics 66, no. 1 (January 1, 1988): 1–6. http://dx.doi.org/10.1139/p88-001.

Full text
Abstract:
The polarization dependences of some resonant multiphoton ionizations in atomic mercury have been measured with a broadband (bandwidth ≈ 1.5 cm−1) multimode dye laser at moderate light intensities (≈ 500 MW∙cm−2). The multiphoton processes studied were the absorption of four photons to a resonant 1S0, 1D2, or 3D2 level by one-photon ionization. Complete saturation of the one-photon ionization step results in the ionization of all atoms excited to the resonant level. Because of the saturation of the ionization step, the polarization dependence of the four-photon excitation to the resonant level is measured. The theory developed by Dalby et al. is shown to give good agreement with the experiment when it is used to calculate the polarization dependence of the multiphoton transition to the resonant level. For the 6d1D2 resonance, distortions in the polarization dependence and an unusual linewidth dependence on the light polarization were observed. We relate these observations to the alternating current Stark effect and to the production of the third harmonic of the laser light in the focal volume.
APA, Harvard, Vancouver, ISO, and other styles
10

Sharma, Kamlesh Kumar, and Sanjeev Saxena. "Electron (Positron) Impact Ionization of Xenon." Indian Journal of Applied Research 3, no. 11 (October 1, 2011): 454–55. http://dx.doi.org/10.15373/2249555x/nov2013/145.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "IONIZATON"

1

Zhi, Qiu. "Study of Ionizaton of Quantum Systems with Delta Potentials in Damped and Undamped Time Periodic Fields." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1250019795.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Love, Natalie Anne. "Studies of electron ionization." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1444953/.

Full text
Abstract:
This thesis presents the results of experimental investigations to determine the electron ionization cross-sections of gases used in plasma etching processes. The small molecules studied include boron trichloride (BCI3), nitrous oxide (N20), sulphur hexafluoride (SF6) and acetylene (C2H2). The knowledge of accurate electron ionization cross-sections is essential for the modelling and optimization of plasmas used in industry and for the purposes of atmospheric modelling. It is therefore surprising that despite the widespread industrial use of these small molecules there have been few investigations of their ionization. It is the lack of available electron ionization cross-section data that provides the motivation for the investigations detailed in this thesis. The formation and dissociation of singly charged (monocations), doubly charged (dications) and triply charged molecular ions (trications) are studied using pulsed electron ionization (30-200 eV) coupled with time-of-flight (TOF) mass spectrometry and a two-dimensional (2D) ion coincidence technique. The experimental technique and data analysis procedures adopted allow the contribution to the total ion yield from single and multiple ionization to be distinguished and quantified. Such information yields relative partial ionization cross-sections (PICSs) and also allows relative precursor specific PICSs to be determined, which quantify the contribution from single, double and triple ionization to the relative yields of the fragment ions formed following electron-molecule collisions. Relative precursor specific PICSs therefore provide a more 'in-depth' chemical picture of each PICS. The relative precursor specific PICSs determined, following electron interaction with N20, provide clear evidence of energetic ion loss in previous cross-section determinations detailed in the literature. In addition, the 2D ion coincidence technique provides information on the energetics involved in the dissociation of any multiply charged ions formed. In the case of BCI3, further insight on the possible dissociation dynamics of BC132+ is reported. Following the investigations of N2O, BCI3 and SF6, the apparatus was commissioned to produce absolute partial ionization cross-sections and absolute precursor specific partial ionization cross-sections from 30-200 eV. Experimentally, the commissioning involved the addition of a Spinning Rotor Gauge (SRG) and a new gas inlet line to the source region. These investigations have extended the data determined for the electron ionization of N20 and have also enabled the absolute cross-section data for the electron ionization of C2H2 to be determined.
APA, Harvard, Vancouver, ISO, and other styles
3

Condren, D. S. "Wannier or relativistic ionization." Thesis, Queen's University Belfast, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.479245.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Szluińska, Marta. "Positron induced ionization process." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404930.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Murtagh, Daniel James. "Positron impact ionization phenomena." Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1446030/.

Full text
Abstract:
In the present work, a beam of positrons, obtained from a radioactive source (MNa) in conjunction with a W moderator and guided by a magnetic field, has been used to investigate low energy positron-impact ionization phenomena from atomic and molecular targets. For He below threshold, the investigation discovered vacuum contaminants in creased with gas load and hence concluded that the high 7-ray/ion signal observed by Szluinska and Laricchia (2004a) in Ne could not be safely attributed to annihila tion. A detailed measurement of the total ionization cross-section for He has been performed from below threshold for Ps formation to high energy. Combined with previously measured data and previously measured direct ionization cross-sections (Moxom et al 1996, Ashley et al 1996), a new determination of the positronium formation cross-section has been achieved and compared to other available experi mental measurements and theoretical calculations. Measurements of the excited state (n > 1) positronium formation cross-section for He and Ar have been performed and compared to available theoretical calcu lations. This work has been motivated both for a direct comparison with theory and to test the hypothesis that structure observed in the total (all n) positron ium formation cross-sections for the heavier noble gases, is due to excited state positronium formation (Laricchia et al 2002). The present study is unable to verify fully this hypothesis due to the experimental methods insensitivity to positronium formation in to the 2S or n > 2 states. However, the present results are close to the most sophisticated theoretical calculation of positronium formation into the 2P state (Campbell et al 1998).
APA, Harvard, Vancouver, ISO, and other styles
6

TAVARES, ANDRÉ CARLOS. "MULTIPLE IONIZATION OF NOBLE GASES BY PROTONS: IONIZATION PROBABILITIES AND POST–COLISIONAL EFFECTS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=18488@1.

Full text
Abstract:
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Nesta dissertação são apresentados cálculos detalhados de seções de choque de ionização múltipla de gases nobres por prótons de velocidades intermediárias. Foi realizado um estudo detalhado sobre a importância das probabilidades tanto de ionização direta de elétrons de cada subcamada como das probabilidades de emissão pós-colisional. Uma comparação com resultados teóricos e experimentais disponíveis na literatura também foi realizada. Com o intuito de investigar a influência dos valores adotados para as probabilidades de ionização em cada subcamada, foram realizadas versões que deixavam de levar em conta, gradativamente, a participação das diversas subcamadas do alvo. Foi analisada também a utilização de diferentes fontes de probabilidades de emissão pós-colisional. Observou-se que, para os estados de carga finais mais elevados, as seções de choque de ionização múltipla se tornam cada vez mais sensíveis tanto às probabilidades de ionização direta quanto às probabilidades de emissão pós-colisional.
In this dissertation, detailed calculations of multiple ionization cross sections of noble gases by intermediate-velocity protons are presented. A detailed study on the relative importance of the probabilities for both the direct ionization of electrons from a given sub-shell and the postcollisional emission has been performed. The cross sections obtained in this work have also been compared to the experimental data and theoretical results available in the literature. In order to investigate the influence of the adopted values for the probabilities of direct ionization of each target sub-shell, different versions of the general equations have been used, in which the participation of each sub-shell has been gradually neglected. The use of probabilities for postcollisional emission from different authors has also been analyzed. It was observed that, for higher final charge states, the multiple ionization cross sections become more and more sensitive to both the direct ionization and the post-collisions emission probabilities.
APA, Harvard, Vancouver, ISO, and other styles
7

Tung, Selena C. W. "Ionization of gases by slow monoenergetic electrons." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28351.

Full text
Abstract:
Electron impact ionization is an important phenomenon touching many areas of science, and much research has been done over the years on various aspects of this process. Efforts to establish the precise variation of ionization cross section with energy were initiated in the early 1950's; however, severe disagreements between experimental data concerning fine structure observed in the electron impact ionization efficiency curves were reported from laboratory to laboratory. The work in this thesis has been largely devoted to establishing the credibility of the method of electron impact ionization by monoenergetic electron beam in the study of such fine structure. The design and construction of an apparatus to study the ionization of atoms and molecules by an electron beam of narrow energy width are described, and preliminary data on krypton and argon near the ionization threshold energies discussed. A sound basis has been laid for further development in this field.
Science, Faculty of
Chemistry, Department of
Graduate
APA, Harvard, Vancouver, ISO, and other styles
8

Almowalad, Najah K. "Elimination of Electrochemical Oxidation during Sample Ionization Using Liquid Sample Desorption Electrospray Ionization (DESI)." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1474911988216817.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Trachy, Marc Lawrence. "Photoassociative ionization in cold rubidium." Diss., Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/695.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Curran, Edwin Paul. "Electron impact ionization of atoms." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328062.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "IONIZATON"

1

Märk, Tilmann D., and Gordon H. Dunn, eds. Electron Impact Ionization. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-4028-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Domin, Marek, and Robert Cody, eds. Ambient Ionization Mass Spectrometry. Cambridge: Royal Society of Chemistry, 2014. http://dx.doi.org/10.1039/9781782628026.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Chemical ionization mass spectrometry. 2nd ed. Boca Raton, Fla: CRC Press, 1992.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Gomer, R. Field emission and field ionization. New York: American Institute of Physics, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Peter Andreas Maria van Hoof. Photo-ionization studies of nebulae. Groningen: Rijksuniversiteit Groningen, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Makishima, Akio. Thermal Ionization Mass Spectrometry (TIMS). Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527696413.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Gomer, Robert. Field emission and field ionization. New York: American Institute of Physics, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Miller, George. Radiative properties of molecular nitrogen ions produced by helium penning ionization and argon effects: Interim report for the period September 1, '93 to February 4, '94. [Washington, DC: National Aeronautics and Space Administration, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Baragiola, Raúl A. Ionization of Solids by Heavy Particles. Boston, MA: Springer US, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Rogers, Kevin Shaun. Laser desorption/laser ionization mass spectrometry. Salford: University of Salford, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "IONIZATON"

1

Younger, S. M. "Quantum Theoretical Methods for Calculating Ionization Cross Sections." In Electron Impact Ionization, 1–23. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-4028-4_1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Younger, S. M., and T. D. Märk. "Semi-Empirical and Semi-Classical Approximations for Electron Ionization." In Electron Impact Ionization, 24–41. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-4028-4_2.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Read, F. H. "Threshold Behaviour of Ionization Cross-Sections." In Electron Impact Ionization, 42–88. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-4028-4_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Teubner, P. J. O. "Differential Ionization Cross Sections." In Electron Impact Ionization, 89–136. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-4028-4_4.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Märk, T. D. "Partial Ionization Cross Sections." In Electron Impact Ionization, 137–97. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-4028-4_5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Powell, C. J. "Innershell Ionization Cross Sections." In Electron Impact Ionization, 198–231. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-4028-4_6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

de Heer, F. J., and M. Inokuti. "Total Ionization Cross Sections." In Electron Impact Ionization, 232–76. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-4028-4_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Dunn, G. H. "Electron-Ion Ionization." In Electron Impact Ionization, 277–319. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-4028-4_8.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Lindinger, W., F. Howorka, J. M. Shull, A. V. Phelps, E. C. Zipf, Y. K. Kim, and J. H. Futrell. "Applications." In Electron Impact Ionization, 320–75. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-4028-4_9.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Gooch, Jan W. "Ionization." In Encyclopedic Dictionary of Polymers, 396. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_6453.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "IONIZATON"

1

Jiao, Jian, and Zhixiong Guo. "Analysis of USP Laser Induced Ablation Threshold in Transparent Aqueous Tissue." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75175.

Full text
Abstract:
The ultrashort pulsed (USP) laser induced plasma-mediated ablation in transparent media is modeled and studied in this work. We propose that a certain number of free electrons are required to trigger the avalanche ionization for the first time. Based on this assumption, the ablation process is postulated as two separate processes — the multiphoton and avalanche ionizations. For USP laser induced ablation in the transparent corneal epithelium at 800 nm, the critical seed free-electron density and the time to initialize the avalanche ionization for pulse widths from picoseconds down to the femtoseconds range are calculated. It is found that the critical seed free-electron density decreases as the pulse width increases, obeying a tp−5.65 rule. Moreover, this model is also extended to the estimation of crater sizes in USP laser ablation of polydimethylsiloxane (PDMS). The crater sizes ablated in a PDMS by a 900 fs pulsed laser at wavelength 1552 nm are modeled using the present model, and the results match with the existing experimental measurements.
APA, Harvard, Vancouver, ISO, and other styles
2

Jiang, L., and H. L. Tsai. "Ultrafast Photon-Electron Interactions in Dielectrics by a Single Laser Pulse." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-59288.

Full text
Abstract:
This study develops a quantum mechanical model to investigate energy absorption in ultrafast laser of dielectrics. The model investigates the optical property variations, electron temperature, and density changes at femtosecond scales. The ionizations and electron heating are two major factors considered for pulse absorption occurring within the pulse duration. The flux-doubling model is employed to calculate the free electron generation mainly through impact ionization and photoionization. The quantum mechanical treatments are used to account for the specific heat and the relaxation time for free electrons. The time and space dependent optical properties of the dense plasma generated by the ultrafast laser pulse are calculated. The predictions of ablation threshold and ablation depth of fused silica and barium aluminum borosilicate (BBS) are in good agreements with published experimental data. The model greatly improves the accuracy in predicting the ablation depth and can predict the crater shape.
APA, Harvard, Vancouver, ISO, and other styles
3

Qian, Nan, Guanghua Wang, Huang Yu, Youshi Zeng, Guangliang Bao, Shengwei Wu, and Wei Liu. "Electric Field Simulation of Ionization Chamber Used in Tritium Measurement in Tail Gas of Molten Salt Reactor." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82026.

Full text
Abstract:
There is a large amount of tritium in tail gas emitting from the molten salt reactor. The content of tritium content in tail gas must be measured and controlled according to the national standard. Nowadays, the ionization chamber and the liquid scintillation counter are mainly used for tritium monitoring. The proportional counter required pure sampling gas, and the liquid scintillation cannot measure the radioactivity online. Only the ionization chamber could measure the activities of off-gas from molten salt reactor. In order to reduce tritium contamination in the ionization chamber, a wire type high pressure ionization chamber was used in measuring tail gas from molten salt reactor. In order to improve the ion collection efficiency of the wire type electrode ionization chamber, it is necessary to optimize the number of the electrodes. In this study, the electric field of ionization chamber with different numbers of electrodes, such as 3, 6, 12, 18, 24, 30, 36, 42, 48, were simulated by COMSOL software. The equipotential line of electric field near the collector is round. The equipotential line of electric field near the high voltage wires present as undulate. From the results, the optimum number of wires was 36. The difference of electric field between two types chambers were less than 5%. After that, collection efficiency was simulated as well. Increasing the number of the high voltage electrode at top and bottom of effective area could not improve the electron collection efficiency. Making the ionization chamber shell as an insulator can effectively improve the electrons collection efficiency.
APA, Harvard, Vancouver, ISO, and other styles
4

Estefanous, Fadi. "Modeling of Ion Current Signal in Diesel Combustion." In ASME 2013 Internal Combustion Engine Division Fall Technical Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icef2013-19090.

Full text
Abstract:
Ionization in internal combustion engines produces a signal indicative of in-cylinder conditions that can be used for the feedback electronic control of the engine, to meet production goals in performance, fuel economy and emissions. Most of the research has been conducted on carbureted and port injection spark ignition engines where the ionization mechanisms are well defined. A limited number of investigations have been conducted on ionization in diesel engines because of its complex combustion process. In this study, a detailed ionization mechanism is developed and introduced in a 3-D diesel cycle simulation computational fluid dynamics (CFD) code to determine the contribution of different species in the ionization process at different engine operating conditions. The CFD code is coupled with DARS-CFD, another module used to allow chemical kinetics calculations. The three-dimensional model accounts for the heterogeneity of the charge and the resulting variations in the combustion products. Furthermore, the model shows the effects of varying fuel injection pressure and engine load on the ion current signal characteristics. Ion current traces obtained experimentally from a heavy duty diesel engine were compared to the 3-D model results. The results of the simulation indicate that some heavy hydrocarbons, soot precursors play a major role, in addition to the role of NOx in ionization in diesel combustion.
APA, Harvard, Vancouver, ISO, and other styles
5

Sun, Shixin. "Photoionization of dipeptides with femtosecond laser pulses." In RESONANCE IONIZATION SPECTROSCOPY 2000: Laser Ionization and Applications Incorporating RIS; 10th International Symposium. AIP, 2001. http://dx.doi.org/10.1063/1.1405575.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Heinicke, Ralf. "Laser ion kinetics: Application of a single shot femtosecond pump-probe technique." In RESONANCE IONIZATION SPECTROSCOPY 2000: Laser Ionization and Applications Incorporating RIS; 10th International Symposium. AIP, 2001. http://dx.doi.org/10.1063/1.1405576.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Hankin, S. M. "Ultrafast laser time-of-flight mass analysis of laser-desorbed atoms and molecules." In RESONANCE IONIZATION SPECTROSCOPY 2000: Laser Ionization and Applications Incorporating RIS; 10th International Symposium. AIP, 2001. http://dx.doi.org/10.1063/1.1405577.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Miyake, Y. "Improvement of the detection limit of hydrogen by Lyman-α RIS." In RESONANCE IONIZATION SPECTROSCOPY 2000: Laser Ionization and Applications Incorporating RIS; 10th International Symposium. AIP, 2001. http://dx.doi.org/10.1063/1.1405578.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Muller, Jean-François. "The FTICRMS laser microprobe: Speciation of surfaces in resonant laser ablation/ionization (RLA)." In RESONANCE IONIZATION SPECTROSCOPY 2000: Laser Ionization and Applications Incorporating RIS; 10th International Symposium. AIP, 2001. http://dx.doi.org/10.1063/1.1405579.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Philipsen, Vicky. "Electronic processes during ion-beam sputtering of metals studied by resonance laser ionization mass spectrometry." In RESONANCE IONIZATION SPECTROSCOPY 2000: Laser Ionization and Applications Incorporating RIS; 10th International Symposium. AIP, 2001. http://dx.doi.org/10.1063/1.1405580.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "IONIZATON"

1

Young, J. P. (Resonance ionization spectroscopy). Office of Scientific and Technical Information (OSTI), October 1990. http://dx.doi.org/10.2172/6590114.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Bouhal, A., G. Hamoniaux, A. Mysyrowicz, A. Antonetti, P. Breger, P. Agostini, R. C. Constantinescu, H. G. Muller, and L. F. DiMauro. Two-photon ionization and three-photon above-threshold ionization of argon. Office of Scientific and Technical Information (OSTI), March 1998. http://dx.doi.org/10.2172/573347.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Schutt, Timothy C., and Manoj K. Shukla. Computational Investigation on Interactions Between Some Munitions Compounds and Humic Substances. Engineer Research and Development Center (U.S.), February 2021. http://dx.doi.org/10.21079/11681/39703.

Full text
Abstract:
Humic acid substances (HAs) in natural soil and sediment environments effect the retention and degradation of insensitive munitions compounds and legacy high explosives (MCs): DNAN, DNi- NH4+, nMNA, NQ, NTO (neutral and anionic forms), TNT, and RDX.A humic acid model compound has been considered using molecular dynamics, thermodynamic integration, and density functional theory to characterize the munition binding ability, ionization potential, and electron affinity compared to that in the water solution. Humic acids bind most compounds and act as both a sink and source for electrons. Ionization potentials suggest HAs are more susceptible to oxidation than the MCs studied. The electron affinity of HAs are very conformation-dependent and spans the same range as the munition compounds. When HAs and MCs are complexed the HAs tend to radicalize first thus buffering MCs against reductive as well as oxidative attacks.
APA, Harvard, Vancouver, ISO, and other styles
4

Bates, David R. Ionization and Neutralization Processes. Fort Belvoir, VA: Defense Technical Information Center, April 1990. http://dx.doi.org/10.21236/ada230572.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Siegfried, M. Laser-Induced Ionization Efficiency Enhancement On A Filament For Thermal Ionization Mass Spectrometry. Office of Scientific and Technical Information (OSTI), October 2015. http://dx.doi.org/10.2172/1224031.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

O'Connell, Caolionn L., and Phys Dept /Stanford U. Plasma Production via Field Ionization. US: Stanford Linear Accelerator Center (SLAC), September 2005. http://dx.doi.org/10.2172/878428.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Alexahin, Y., D. Neuffer, and E. Prebys. Ionization Cooling for Muon Experiments. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1326604.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Johnson, Rolland P. Ionization Cooling using Parametric Resonances. Office of Scientific and Technical Information (OSTI), June 2008. http://dx.doi.org/10.2172/929284.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Connolly, R., P. Cameron, T. Shea, and R. Witkover. Ionization Profile Monitor for SNS. Office of Scientific and Technical Information (OSTI), March 1999. http://dx.doi.org/10.2172/1157237.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Neuffer, David. Comments on Ionization Cooling Channel Characteristics. Office of Scientific and Technical Information (OSTI), December 2013. http://dx.doi.org/10.2172/1128467.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'IONIZATON' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography