Accession Number : AD0758500

Title :   Application of the Harris Expansion Method to the Elastic S-Wave Scattering of Electrons by Hydrogen Atoms and by Singly Ionized Helium.

Descriptive Note : Doctoral thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Haskell,Hugh Brasher

Report Date : DEC 1972

Pagination or Media Count : 172

Abstract : The Harris expansion method was applied to the elastic s-wave scattering of low energy electrons from hydrogen atoms and singly ionized helium atoms. The trial wave functions are Hylleraas functions of 22, 34, 50 and 70 parameters. It was found that reasonably accurate values of 2-H phase shifts can be calculated but e-He(+) phase shifts are substantially less reliable. It is shown that the Harris method gives an accurate depiction of the location, but not the width, of the scattering resonances. Singlet and triplet s-wave phase shifts for e-H and e-He(+) scattering were compared with the results of other calculations, and H(-) and He S state energy levels including the auto-ionizing levels are presented and compared with other calculations and with experiment. It is tentatively concluded that the Harris method does not work on systems whose long range potential is of the Coulomb type. (Author)

Descriptors :   (*HYDROGEN, ELASTIC SCATTERING), (*HELIUM, ELASTIC SCATTERING), ATOMS, IONS, COMPUTER PROGRAMS, WAVE FUNCTIONS

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE