Ramsauer-Townsend minima in the electron-scattering cross sections of polyatomic gases: methane, ethane, propane, butane, and neopentane

McCorkle, D.L.; Christophorou, L. G.; Maxey, D.V.; Carter, J G

doi:10.1088/0022-3700/11/17/018

Cited by 57 publications

(20 citation statements)

References 18 publications

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“…Whereas their drift velocity values for propane agree with our result to within ±5%, their data for ethane and isobutane exhibit behaviour similar to methane, the drift velocities being up to 15% higher for low reduced fields. The data of McCorkle et al (1978) for ethane and propane are consistent with our results within their quoted error of ±5%. In contrast to the situation found in methane, the vintage measurement of longitudinal diffusion in ethene by Wagner and co-workers (1967) exhibits systematic deviations of up to ±30%.…”

Section: Results and Comparison With Other Experimentssupporting

confidence: 92%

Drift Velocity, Longitudinal and Transverse Diffusion in Hydrocarbons derived from Distributions of Single Electrons

Schmidt¹,

Roncossek²

1992

Aust. J. Phys.

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A time of flight method is described which allows the simultaneous measurement of drift velocity w and the ratios of the longitudinal and transverse diffusion coefficients to mobility (DL/JL, DT/JL) of electrons in gases. The accuracy achieved in this omnipurpose experiment is comparable with that of specialised techniques and is estimated to be ±1 % for w and ±5% for the D / JL measurements .. Results for methane, ethane, ethene, propane, propene and cyclopropane for values of E/N (the electric field strength divided by the number density) ranging from 0·02 to 15 Td are presented and discussed (1 Td = 10-21 Vm 2 ).

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Section: Results and Comparison With Other Experimentssupporting

confidence: 92%

Drift Velocity, Longitudinal and Transverse Diffusion in Hydrocarbons derived from Distributions of Single Electrons

Schmidt¹,

Roncossek²

1992

Aust. J. Phys.

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“…However, the behavior of the s-wave eigenphase shows that this rise is not related to a virtual state. Figure 6 shows our calculated momentum transfer cross section with and without extra centers obtained in the SEP approximation compared to the complex Kohn results also obtained in the SEP approximation and to the experimental data of Duncan and Walker [3] and McCorkle et al [5]. There is relative good agreement between our results and the other results shown in this figure.…”

Section: Resultssupporting

confidence: 80%

Low-energy electron collisions with ethane

2009

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We employed the Schwinger multichannel method to compute elastic cross sections for low-energy electron collisions with ethane (C 2 H 6 ). The calculations were carried out in the static-exchange and static-exchange plus polarization approximations for energies up to 12 eV. Our integral cross section shows good agreement with experimental data and with theoretical results for energies above 5 eV. There are some differences for energies below 5 eV between our results and the available experimental and theoretical results. Our differential cross sections also agree well with the experiment and with theory for energies above 5 eV; below this energy our results agree in shape, but are smaller than the available experimental and theoretical results. We discuss possible reasons for these discrepancies. We found a broad structure in the integral cross section around 8.5 eV and also a Ramsauer-Townsend minimum around 0.2 eV. These results are in agreement with the experimental observations and theoretical results.

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“…The case of correlated target wavefunctions is obviously more complicated, and we defer a discussion of that case to a later publication. The encouraging result of the studies reported here is that some common features, which are pure McCorkle et al (1978). 349 correlation effects, of electron-polyatomic molecule scattering are well described by this simple ab initio treatment of correlation.…”

Section: Discussionsupporting

confidence: 58%

Low-energy Electron Scattering from Polyatomic Molecules: The Role of Electron Correlation

McCurdy¹

1992

Aust. J. Phys.

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Until recently the principal barrier to the accurate theoretical description of electronic collisions with polyatomic molecules was the problem of scattering by a nonlocal potential which is arbitrarily asymmetric. The last five or six years have seen the development of numerical techniques capable of solving the potential scattering problem, and the first applications of methods for treating many-body aspects of collisions of electrons with polyatomic molecules are beginning to appear in the literature. We describe the complex Kohn method and the use, in scattering calculations, of methods for treating electronic correlation which are standard in bound-state quantum chemistry. As examples of the application of these ideas we present the results of calculations on electron scattering from CH4, SiH4 and C 2 H6. All of these molecules exhibit Ramsauer-Townsend minima at low impact energies which are entirely correlation effects.

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Ramsauer-Townsend minima in the electron-scattering cross sections of polyatomic gases: methane, ethane, propane, butane, and neopentane

Cited by 57 publications

References 18 publications

Drift Velocity, Longitudinal and Transverse Diffusion in Hydrocarbons derived from Distributions of Single Electrons

Drift Velocity, Longitudinal and Transverse Diffusion in Hydrocarbons derived from Distributions of Single Electrons

Low-energy electron collisions with ethane

Low-energy Electron Scattering from Polyatomic Molecules: The Role of Electron Correlation

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