Calculation of Single- and Double-Photon Free-Free Cross Sections for Electrons Scattered from HE, C, N, NE and AR.
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 W/cc. Keywords: Electron scattering; Free-free radiation; Perturbation theory; Frequency dependence.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1986
- Accession Number
- ADA167019
Entities
People
- Edward J. Robinson
Organizations
- New York University