Accession Number : AD0611635

Title :   THE PROBABILITY OF ELECTRON CAPTURE AT FIXED SCATTERING ANGLES IN H+-H COLLISIONS,

Corporate Author : QUEEN'S UNIV BELFAST (NORTHERN IRELAND)

Personal Author(s) : Smith,Francis J.

Report Date : 02 SEP 1964

Pagination or Media Count : 12

Abstract : The wave treatment of electron capture is used in calculations of differential cross sections for H(+)-H collisions at different scattering angles and at energies between 100 ev and 2 kev. It is shown that the impact parameter treatment is inaccurate for calculations of differential capture cross sections except at high energies and large scattering angles, that is above about 5 kev when the scattering angle of the incident proton is 0.5 deg and above about 0.5 kev when the scattering angle is 5 deg. At small angles and energies the two-state wave approximation shows considerable damping of the oscillations in the probability of electron capture, in qualitative agreement with experiment. The damping due to this wave effect is compared with that due to 2p sigma sub u - 2p p. sub u coupling (based on calculations made by Bates and Williams in 1964), and it is shown that the wave effect causes more damping especially at low energies. The two-state wave treatment is corrected for 2p sigma sub u - 2p p. sub u coupling in the case of 3 deg scattering and compared with the experimental results of Lockwood and Everhart obtained in 1962. Closer agreement with experiment is obtained than hitherto. The effect of rainbow scattering, important at low energies and for small scattering angles, is also discussed. (Author)

Descriptors :   (*ELECTRON CAPTURE, PROBABILITY), (*PROTON SCATTERING, ELECTRON CAPTURE), DIFFERENTIAL CROSS SECTIONS, PROTONS, HYDROGEN, DAMPING, QUANTUM THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE