Skip to main content
Article
Triple Differential Cross Sections for Electron-Impact Ionization of Methane at Intermediate Energy
Journal of Chemical Physics
  • Esam Ali
  • Carlos Granados
  • Ahmad Sakaamini
  • Don H. Madison, Missouri University of Science and Technology
Abstract

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. Overall, good agreement was found between experiment and theory.

Department(s)
Physics
Sponsor(s)
National Science Foundation (U.S.)
Comments
This work was partly supported by the US National Science Foundation under Grant. No. PHY-1505819 and by the National Natural Science Foundation of China under Grant No. 11174175.
Keywords and Phrases
  • Electron energy levels,
  • Molecular orbitals, Electron impact-ionization,
  • Highest occupied molecular orbital,
  • Incident electrons,
  • Intermediate energies,
  • Single ionization,
  • Sturmian functions,
  • Theoretical investigations,
  • Triple differential cross sections, Impact ionization
Document Type
Article - Journal
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2019 The Authors, All rights reserved.
Publication Date
5-1-2019
Disciplines
Citation Information
Esam Ali, Carlos Granados, Ahmad Sakaamini and Don H. Madison. "Triple Differential Cross Sections for Electron-Impact Ionization of Methane at Intermediate Energy" Journal of Chemical Physics Vol. 150 Iss. 19 (2019) ISSN: 0021-9606; 1089-7690
Available at: http://works.bepress.com/don-madison/259/