Accession Number : AD0674065

Title :   THEORETICAL STUDIES ON INELASTIC COLLISIONS OF ELECTRONS WITH ATOMS AND MOLECULES.

Descriptive Note : Final rept. Jan 65-May 68,

Corporate Author : OKLAHOMA UNIV RESEARCH INST NORMAN

Personal Author(s) : Lin,Chun C.

Report Date : MAY 1968

Pagination or Media Count : 30

Abstract : Electron exicitation cross sections of the transitions between the three spin multiplets J = 0,1,2 of the ((1s)2(2s)2(2p)4)3p ground state of the neutral oxygen atom were calculated for electron energies of 500-10,000K using the method of partial-wave analysis. Under an exact-resonance approximation, the scattering equations for the s-wave and p-wave can be obtained by numerical iteration. Vibrational excitation cross sections of diatomic molecules were calculated using the Born approximation by including the polarization interaction between the incident electron and the molecule. For the non-polar molecules, the polarization term increases the cross sections by an order of magnitude or more over the previous calculations, while in the case of the CO molecule, the contribution from the polarization term is comparable to that from the monopole-dipole interaction. The method of close coupling has been applied to calculate the electron excitation cross sections of helium. For the 1P states the close-coupling cross sections are nearly the same as the Born values, but the former became four times and forty times larger than the latter for 1D and 1F, respectively. The increase in cross sections may be ascribed to the indirect coupling via the 1P states. (Author)

Descriptors :   (*DIATOMIC MOLECULES, *ELECTRON IRRADIATION), (*OXYGEN, ELECTRON IRRADIATION), (*HELIUM, ELECTRON IRRADIATION), ATOMIC ENERGY LEVELS, MOLECULAR ENERGY LEVELS, EXCITATION, PROBABILITY, SCATTERING, VIBRATION, POLARIZATION, CARBON MONOXIDE

Subject Categories : Atmospheric Physics
      Atomic and Molecular Physics and Spectroscopy
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE