Accession Number:

ADA167019

Title:

Calculation of Single- and Double-Photon Free-Free Cross Sections for Electrons Scattered from HE, C, N, NE and AR.

Descriptive Note:

Final rept. Sep 80-Feb 83,

Corporate Author:

NEW YORK UNIV NY DEPT OF PHYSICS

Personal Author(s):

Report Date:

1986-02-01

Pagination or Media Count:

52.0

Abstract:

Calculations of cross sections for the free-free absorption of radiation by electrons scattered from atoms are reported. The results apply in the limit where theory is valid, and are obtained in the context of a realistic independent particle atomic model, which facilitates numerical solutions for both perturbed and unperturbed wave functions. Both one photon and two photon absorptions are analyzed, the latter in a mixed gauge representation. The method is applied to several different atomic targets--the ground states of He, for frequencies corresponding to the 3S1 and 1So states of He, for frequencies corresponding to the carbon dioxide, neodymium, and ruby lasers. The low-frequency results agree well with the soft-photon approximation, while, as one might expect, the numbers at shorter wavelengths diverge. For all cases, it was found that the free-free cross sections were negligibly small compared to radiationless cross sections, for intensities no greater than 1000000 Wcc. Keywords Electron scattering Free-free radiation Perturbation theory Frequency dependence.

Subject Categories:

  • Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE