Vibrational excitation cross sections of methane by electron impact

Shyn, T. W.

doi:10.1088/0953-4075/24/24/014

Cited by 23 publications

(38 citation statements)

References 6 publications

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“…Note that since the experimental differential cross sections of Tanaka et al (1983), shown in figure 2, and of Shyn (1991) are lower than the more recent results of Bundschu et al (1997) and Allan (2007), they yield the integral cross sections that agree well with the calculation of Nishimura and Gianturco (2002). The present calculated cross sections, larger because of the more elaborate treatment of the exchange interactions, agree well with the more recent experimental cross sections of Bundschu et al (1997) and Allan (2007).…”

Section: Resultssupporting

confidence: 87%

“…The agreement extends even to large scattering angles, where the data of Shyn (1991) drop, particularly at 5 eV. Figure 2 also displays the role of correlation-polarization forces in the resonant region.…”

Section: Resultsmentioning

confidence: 56%

“…The dramatic effect played by correlation and polarization at energies below about 12 eV is evident, particularly for the symmetric stretch vibration ν 1 . As already stated above, the data of Tanaka et al (1983) and Shyn (1991) appear to be too low.…”

Section: Resultsmentioning

confidence: 78%

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Vibrational excitation of methane by slow electrons revisited: theoretical and experimental study

Čurík

Čárský

Allan

2008

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

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We have calculated and measured differential and integral cross sections for vibrationally inelastic scattering of electrons by methane molecules. The calculations were carried out using the discrete momentum representation (DMR) method. We solved the two-channel Lippmann-Schwinger equation in the momentum space. The interaction between the scattered electron and the target molecule is described by the exact static-exchange potential. Correlation-polarization forces were included by a simple local density functional theory potential of Perdew and Zunger (1981 Phys. Rev. B 23 5048). The cross sections calculated in this way agree very well with our measurement and with other more recent experimental data, but are larger than some older experimental and theoretical results.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 56%

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Vibrational excitation of methane by slow electrons revisited: theoretical and experimental study

Čurík

Čárský

Allan

2008

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

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“…The vertical scales apply to the lowest spectra and the remaining spectra are offset upward for clarity, by a factor of ten for every higher energy. The results of Bundschu et al [22], Shyn [27], Tanaka et al [28] and Curry et al [23] are shown for comparison. data is generally satisfactory, but the present data extends the angular range.…”

Section: Methane and Neopentanementioning

confidence: 92%

Improved techniques of measuring accurate electron - molecule cross sections near threshold and over a large angular range

Allan

2007

AIP Conference Proceedings

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Abstract. Methods to measure absolute differential elastic and vibrational excitation cross sections using an electron spectrometer with a magnetic angle changer are discussed. Emphasized are the need to by-pass drifts and to properly correct for the instrumental response function when angle of detection or electron energy are varied. The results are illustrated with cross sections in nitrogen, methane and neopentane. The good agreement of the results with the experimental data from other leading groups (taken mostly without the angle changer) and with some theories indicate that the measurements are reliable. The angle-integrated data agrees well with the results of electrontransport experiments. Good agreement with theory is obtained for nitrogen, even in the difficult low-energy region. Electronic excitation in rare gases is also briefly mentioned.

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“…[25][26][27][28][29][30] The basic source of this information is measurements. Unfortunately, the measured cross sections published by different authors usually differ at low and large angles ͑see for example a comparison presented in Ref.…”

Section: B Inelastic Cross Sectionsmentioning

confidence: 99%

Monte Carlo simulation of electron transport in carbon tetrafluoride discharge plasma

Vasenkov

2000

Journal of Applied Physics

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The Monte Carlo technique was used to investigate electron transport in the carbon tetrafluoride discharge plasma. A set of total elastic and inelastic cross sections was assembled on the basis of the critical survey of Christophorou, Olthoff, and Rao [J. Phys. Chem. Ref. Data 25, 1341 (1996)]. Particular attention was given to the derivation of the total and angular elastic cross sections at energies close to the Ramsauer minimum. The experimental angular elastic cross sections were fitted to analytic functions suitable for implementation in the Monte Carlo calculations. Angular inelastic cross sections were analytically represented using a simple Born approximation. Superelastic collisions were included in the calculations in an effort to account properly for the behavior of electrons at low energies. The transport coefficients obtained with the direct simulation agreed with the measurements for the electric field to gas density ratios (E/N) in the range 0.01⩽E/N⩽300 Td. Agreement between calculated and measured reaction-rate coefficients was obtained for E/N below 200 Td. The effect of both elastic and inelastic anisotropic scattering on electron transport in carbon tetrafluoride was studied in detail. This system is typical of molecular systems with a Ramsauer minimum in the elastic cross section.

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Vibrational excitation cross sections of methane by electron impact

Cited by 23 publications

References 6 publications

Vibrational excitation of methane by slow electrons revisited: theoretical and experimental study

Vibrational excitation of methane by slow electrons revisited: theoretical and experimental study

Improved techniques of measuring accurate electron - molecule cross sections near threshold and over a large angular range

Monte Carlo simulation of electron transport in carbon tetrafluoride discharge plasma

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