Very low energy electron scattering in some hydrocarbons and perfluorocarbons

Lunt, S. L.; Randell, J; Ziesel, J. P.; Mrotzek, G; Field, D.

doi:10.1088/0953-4075/31/18/019

Cited by 37 publications

(53 citation statements)

References 44 publications

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“…[29] for detailed explanations). Four-parameter MERT was used also by Lunt et al [42,43] to analyse backward-scattering cross sections in the 0.013-0.175 eV energy range.…”

Section: Modified Effective Range Approachmentioning

confidence: 99%

Ramsauer-Townsend minimum in methane — modified effective range analysis

Fedus

Karwasz

2014

Eur. Phys. J. D

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Abstract. Electron-scattering cross sections in methane are analysed in the very-low energy region. The correspondence between integral elastic, elastic differential and momentum transfer cross sections is checked via a novel approach to modified effective range theory, in order to determine the depth and position of the Ramsauer-Townsend minimum. Phase shifts of the two lowest partial waves are obtained explicitly and parameterized by four coefficients with the physical meaning of the scattering lengths and the effective ranges. Using recent experiments on vibrational cross sections performed over an extended (0-180• ) angular range and comparing several theories, an agreement within 10% has been obtained between experimental total and present summed (elastic + vibrational) cross sections in the whole 0.1-2.0 eV energy range. An additional check for consistency is done using two-term Boltzmann analysis to derive electron diffusion coefficients. Calculated drift velocities and transversal diffusion coefficients at 0-10 Td reduced electric field agree within 5% with experiments.

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“…[29] for detailed explanations). Four-parameter MERT was used also by Lunt et al [42,43] to analyse backward-scattering cross sections in the 0.013-0.175 eV energy range.…”

Section: Modified Effective Range Approachmentioning

confidence: 99%

Ramsauer-Townsend minimum in methane — modified effective range analysis

Fedus

Karwasz

2014

Eur. Phys. J. D

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“…Ethane is a simple hydrocarbon that has been studied by experimental [3][4][5][6][7][8][9][10][11][12][13][14] and theoretical groups [15][16][17]. This molecule presents a broad structure around 7 eV and a Ramsauer-Townsend minimum below 1 eV (at ∼ 0.2 eV) [13,14,16].…”

Section: Introductionmentioning

confidence: 99%

“…This molecule presents a broad structure around 7 eV and a Ramsauer-Townsend minimum below 1 eV (at ∼ 0.2 eV) [13,14,16]. From the theoretical point of view the description of these two features needs the inclusion of polarization effects.…”

Section: Introductionmentioning

confidence: 99%

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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“…10 Works that later followed these include the electron-impact experimental 11,12 and theoretical 13 ionization cross-section ͑ICS͒ studies and experimental total cross sections ͑TCS͒. [14][15][16][17] On the other hand, a much wider spectrum of works exists in literature on the individual c-C 3 H 6 molecules, i.e., possibly owing to interests in its C-C-C ring structure, in addition to the combined studies with its isomer partner, i.e., the linear C 3 H 6 molecule. These include the experimental [16][17][18] and theoretical 18 TCS and experimental 11 and theoretical 13 ICS.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical elastic cross sections for electron collisions with the C3H6 isomers

Makochekanwa

Kato

Hoshino

et al. 2006

The Journal of Chemical Physics

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In the present work we report cross sections for electron collisions with the isomers propene (C3H6) and cyclopropane (c-C3H6). Electron-scattering differential cross sections (DCS) are reported for measurements carried out for energies 1.5-100 eV and the angular range of 20 degrees-120 degrees. Elastic integral cross sections (ECS), DCS, and momentum-transfer cross sections (MTCS) are reported for calculations carried out using the Schwinger multichannel method with pseudopotentials for the energy range of 2.0-40 eV and angular range of 0 degrees-180 degrees. The resemblance of the pi* shape resonance in the cross sections, observed at 1.5-2.0 eV for propene, to those in C2H4 and C2F4 clearly points to the effect of the double bond in the molecular structures for these molecules. Below 60 eV, we observed clear differences in peak positions and magnitudes between the DCS, ECS, and MTCS for C3H6 and c-C3H6, which we view as the isomer effect.

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Very low energy electron scattering in some hydrocarbons and perfluorocarbons

Cited by 37 publications

References 44 publications

Ramsauer-Townsend minimum in methane — modified effective range analysis

Ramsauer-Townsend minimum in methane — modified effective range analysis

Low-energy electron collisions with ethane

Experimental and theoretical elastic cross sections for electron collisions with the C3H6 isomers

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