Drift Velocity and Longitudinal Diffusion Coefficient of Electrons in CO2?Ar Mixtures and Electron Collision Cross Sections for CO2 Molecules

Nakamura, Yuji

doi:10.1071/ph950357

Cited by 41 publications

(42 citation statements)

References 10 publications

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“…A swarm experiment of Nakamura [45] is available for the momentum transfer cross section data below 100 eV. His data agree well with the result of Ref.…”

Section: Carbon Dioxide Moleculesupporting

confidence: 85%

Analytic Cross Sections for Electron Collisions With Co, Co2, and H2o Relevant to Edge Plasma Impurities

Shirai

Tabata

Tawara

2001

Atomic Data and Nuclear Data Tables

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“…A swarm experiment of Nakamura [45] is available for the momentum transfer cross section data below 100 eV. His data agree well with the result of Ref.…”

Section: Carbon Dioxide Moleculesupporting

confidence: 85%

Analytic Cross Sections for Electron Collisions With Co, Co2, and H2o Relevant to Edge Plasma Impurities

Shirai

Tabata

Tawara

2001

Atomic Data and Nuclear Data Tables

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“…The recommended vibrational excitation cross sections for e 2 impact are 2 3 10 216 cm 2 , 4 3 10 217 cm 2 , and 5 3 10 217 cm 2 for (100), (010), and (001) vibrational modes, respectively, at 5 eV [15]. The present theoretical vibrational-excitation cross sections are in reasonable accord with these values at this energy.…”

supporting

confidence: 84%

Mode Dependence in Vibrational Excitation of aCO2Molecule by Electron and Positron Impacts

et al. 1998

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We have found theoretically, for the first time, that vibrational excitations of a CO 2 molecule by electron ͑e 2 ͒ and positron ͑e 1 ͒ impacts are strongly dependent on the charge of the projectile at impact energy below 6 eV. For the symmetric-stretching mode, the excitation cross section of e 2 impact is larger by 2 to 3 orders of magnitude than that of e 1 impact, while for bending and asymmetric-stretching modes the magnitude of both cross sections for e 2 and e 1 impacts is nearly comparable. These results are qualitatively confirmed experimentally, and are interpreted as the difference of interactions and incident e 2 or e 1 wave functions. [S0031-9007(98)05939-0] PACS numbers: 34.80. Gs, A comparative study of electron ͑e 2 ͒ and positron ͑e 1 ͒ scattering from atoms, molecules, and condensed matter is known to provide a fundamental knowledge of underlying physics for electronic structure and scattering dynamics, and hence, is important for atomic physics, condensed matter physics, and nuclear physics [1]. In addition, this knowledge helps in understanding physics for other collision processes which involve different types of exotic particles. Total cross sections by e 1 impact on atoms and molecules are known to give smaller values than those for e 2 impact below about 100 eV to a few eV region, and this feature has been interpreted as a result of cancellation of static and polarization potentials for e 1 impact while these potentials are added up, along with the additional exchange interaction for e 2 impact, thus causing the stronger interaction. For specific inelastic processes, unfortunately, very few systematic studies by e 1 impact have been performed for gaseous targets, and a detailed comparative study between e 2 and e 1 impact is virtually nonexistent except for some preliminary investigation of experimental results for raregas atoms and simple molecules [2]. Only recently, Gianturco and colleagues [3(a)] have carried out a careful study on e 1 scattering from CO 2 molecule for elastic as well as vibrational excitation processes for the symmetric stretching mode, and have compared it with their previous study [3(b)] for e 2 scattering in order to shed some light on the coupling mechanism.Earlier in our study [4], we have observed that the total cross section for CO 2 for e 2 impact is indeed larger by 40% than that for e 1 impact below 100 eV or so, and continues to be so until the impact energy reaches down to 3 eV. Below 3 eV, however, the magnitude of the cross section is found to reverse, i.e., the total cross section for e 1 impact becomes larger by 25%, although it reverses again at much lower energy around 0.5 eV. At the time, we speculated a possible cause for this phenomena as being due to anomalously large cross sections for either rotational or vibrational excitation, or both for e 1 scattering. An exploratory study for rotational excitations by both projectiles was reported some time ago by Takayanagi and Inokuti [5] based on the Born approximation, who showed that for a molecule wi...

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“…A beam-type measurement was recently made by Tanaka (1998) to obtain DCSs in the low to intermediate energy region. A swarm-type experiment was carried out by Nakamura (1995). He provided ICSs over the energy range from threshold to 100 eV.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of electron scattering from carbon dioxide: excitation of bending vibration

Takekawa¹,

Itikawa²

1999

J. Phys. B: At. Mol. Opt. Phys.

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The electron-impact excitation of a bending-mode vibration of CO 2 is studied theoretically. Differential and integral cross sections are calculated for the vibrational excitation in the range 2.0-50.0 eV. The calculation is based on the fixed-nuclear orientation approximation. A vibrational two-state close-coupling method is employed with an ab initio electrostatic potential and local model potentials for exchange and correlation-polarization interaction. The calculated differential cross sections are found to be satisfactory when compared with experimental data. The resulting integral cross section does not decay quickly at energies above 10 eV, unlike the result of a swarm analysis.

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Drift Velocity and Longitudinal Diffusion Coefficient of Electrons in CO2?Ar Mixtures and Electron Collision Cross Sections for CO2 Molecules

Cited by 41 publications

References 10 publications

Analytic Cross Sections for Electron Collisions With Co, Co2, and H2o Relevant to Edge Plasma Impurities

Analytic Cross Sections for Electron Collisions With Co, Co2, and H2o Relevant to Edge Plasma Impurities

Mode Dependence in Vibrational Excitation of aCO2Molecule by Electron and Positron Impacts

Theoretical study of electron scattering from carbon dioxide: excitation of bending vibration

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