# Accession Number:

## AD0777213

# Title:

## Resonance Scattering of Lyman-Alpha Radiation by Hydrogen in the Ground State

# Descriptive Note:

## Physical sciences research papers

# Corporate Author:

## AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA

# Personal Author(s):

# Report Date:

## 1973-12-06

# Pagination or Media Count:

## 35.0

# Abstract:

The authors calculate the cross section for the resonance scattering of Lyman-alpha radiation by spinless, non-relativistic hydrogen atoms in the ground state using a two-level model. A slight generalization of Diracs resonance scattering theory is used to take into account the degeneracy of the upper state together with the exact matrix elements for the electromagnetic interaction. The shift in position of resonance is finite. The differential cross section is given as a function of the scattering angle for both polarized and unpolarized radiation. The total cross section is shown to be equal to that obtained by detailed balancing using the Einstein A and B coefficients. Finally, the radiation pattern of the scattered radiation is found.

# Descriptors:

# Subject Categories:

- Atomic and Molecular Physics and Spectroscopy