Betrt-a procedure to evaluate the cross section for electron-hydrogen collisions in the bethe approximation to the reactance matrix
✍ Scribed by Alan Burgess; Colm T. Whelan
- Publisher
- Elsevier Science
- Year
- 1987
- Tongue
- English
- Weight
- 609 KB
- Volume
- 47
- Category
- Article
- ISSN
- 0010-4655
No coin nor oath required. For personal study only.
✦ Synopsis
Title of program: BETRT
here is restricted to the electron-hydrogen problem; however it is trivial to modify for use with, any target which can be Catalogue number: AAXK represented as a single electron outside a closed shell (for electron-lithium scattering see ref.
[9]), further many of the Program obtainable from: CPC Program Library, QueenS Ufli-subroutines can be equally well applied to the scattering of an versity of Belfast, N. Ireland (see application form in this electron from any neutral system. In particular the method of issue)
evaluating the important special case of the Weber-Schafheit-
: IBM 3081; Installation: University of Cambridge lin integral [6]: Operating system: MVS ~/id~Jj j,(kr)j,'(k'r)r~~1 dr 0 Programming language used: FORTRAN 77 presented here will lead to a significant reduction in the High speed storage required: variable depends on number of computer time needed in all problems where a high L apchannels proximation to the Born integrals is required [8]. Given the channel analysis the Bethe Reactance matrix Number of lines in program: 1206 elements are calculated for the specified L-range LMIN .LE. L .LE. LMAX, unitarised cross sections produced and the Burgess Keywords: electron-neutral atom collisions, partial wave analy-sum rules applied to calculate the cross sections in the weak sis, Born approximation to Reactance matrix (Born II), Bethe coupling Bethe approximation for L .GE. LMAX [4,6]. approximation to Reactance matrix, Weber-Schafheitlin integrals, Legendre functions of the second kind, Seaton coeffi-References cients, Burgess sum rules