MULTIPHOTON-DETACHMENT CROSS-SECTIONS FOR H-

被引:41
作者
GELTMAN, S
机构
[1] Joint Institute for Laboratory Astrophysics, University of Colorado National Institute of Standards and Technology, Boulder
来源
PHYSICAL REVIEW A | 1991年 / 43卷 / 09期
关键词
D O I
10.1103/PhysRevA.43.4930
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Perturbation theory is applied to the evaluation of the multiphoton-detachment cross sections of H- in a number of approximations. The zero-range plane-wave approximation is the simplest, as its effective dipole matrix element is reducible to a recursive differentiation, and it is applied to the one-to seven-photon-detachment processes. Improvements on this are made in the bound state by means of a short-range potential model and a dynamic screening representation, and in the continuum wave functions with the use of the best previously calculated e-H(1s) singlet scattering phase shifts. The dynamic screening parameters are adjusted to give a good fit of the resulting one-photon cross section to its correct well-known value, and the accurate phase shifts effectively include all the important correlation effects in the free-free amplitudes. These improved wave functions are used for the evaluation of the two- and three-photon generalized detachment cross sections by explicitly carrying out all intermediate state sums. Our best sigma-2 and sigma-3 are estimated to be accurate to order 5%. The present theoretical results are compared with other calculations and recent measurements, revealing areas of agreement as well as certain discrepancies.
引用
收藏
页码:4930 / 4940
页数:11
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