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Title: Triple differential cross sections for electron-impact ionization of methane at intermediate energy

Abstract

We report an experimental and theoretical investigation of electron-impact single ionization of the highest occupied molecular orbital 1 t 2 and the next highest occupied molecular orbital 2 a 1 states of CH 4 at an incident electron energy of 250 eV. Triple differential cross sections measured in two different laboratories were compared with results calculated within the molecular 3-body distorted wave and generalized Sturmian function theoretical models. For ionization of the 1 t 2 state, the binary peak was observed to have a single maximum near the momentum transfer direction that evolved into a double peak for increasing projectile scattering angles, as has been seen for ionization of atomic p-states. A detailed investigation of this evolution was performed. As expected because of its s-type character, for ionization of the 2 a 1 state, only a single binary peak was observed. Altogether, good agreement was found between experiment and theory.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7];  [1]
  1. Missouri Univ. of Science and Technology, Rolla, MO (United States)
  2. Martin-Luther Univ. Halle-Wittenberg, Halle(Saale) (Germany)
  3. Univ. of Manchester, Manchester (United Kingdom)
  4. Univ. de Lorraine, Metz (France)
  5. Ecol Academy, Afyon (Turkey)
  6. Tsinghua Univ., Beijing (China)
  7. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1532725
Alternate Identifier(s):
OSTI ID: 1513065
Report Number(s):
LA-UR-19-22828
Journal ID: ISSN 0021-9606
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 150; Journal Issue: 19; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English

Citation Formats

Ali, Esam, Granados, Carlos, Sakaamini, Ahmad, Harvey, Matthew, Ancarani, Lorenzo Ugo, Murray, Andrew James, Dogan, Mevlut, Ning, Chuangang, Colgan, James Patrick, and Madison, Don. Triple differential cross sections for electron-impact ionization of methane at intermediate energy. United States: N. p., 2019. Web. doi:10.1063/1.5097670.
Ali, Esam, Granados, Carlos, Sakaamini, Ahmad, Harvey, Matthew, Ancarani, Lorenzo Ugo, Murray, Andrew James, Dogan, Mevlut, Ning, Chuangang, Colgan, James Patrick, & Madison, Don. Triple differential cross sections for electron-impact ionization of methane at intermediate energy. United States. doi:10.1063/1.5097670.
Ali, Esam, Granados, Carlos, Sakaamini, Ahmad, Harvey, Matthew, Ancarani, Lorenzo Ugo, Murray, Andrew James, Dogan, Mevlut, Ning, Chuangang, Colgan, James Patrick, and Madison, Don. Thu . "Triple differential cross sections for electron-impact ionization of methane at intermediate energy". United States. doi:10.1063/1.5097670.
@article{osti_1532725,
title = {Triple differential cross sections for electron-impact ionization of methane at intermediate energy},
author = {Ali, Esam and Granados, Carlos and Sakaamini, Ahmad and Harvey, Matthew and Ancarani, Lorenzo Ugo and Murray, Andrew James and Dogan, Mevlut and Ning, Chuangang and Colgan, James Patrick and Madison, Don},
abstractNote = {We report an experimental and theoretical investigation of electron-impact single ionization of the highest occupied molecular orbital 1t2 and the next highest occupied molecular orbital 2a1 states of CH4 at an incident electron energy of 250 eV. Triple differential cross sections measured in two different laboratories were compared with results calculated within the molecular 3-body distorted wave and generalized Sturmian function theoretical models. For ionization of the 1t2 state, the binary peak was observed to have a single maximum near the momentum transfer direction that evolved into a double peak for increasing projectile scattering angles, as has been seen for ionization of atomic p-states. A detailed investigation of this evolution was performed. As expected because of its s-type character, for ionization of the 2a1 state, only a single binary peak was observed. Altogether, good agreement was found between experiment and theory.},
doi = {10.1063/1.5097670},
journal = {Journal of Chemical Physics},
number = 19,
volume = 150,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
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This content will become publicly available on May 16, 2020
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