On the Photoionization of Hydrogen and Helium
Abstract
The total cross-section for the photoionization of helium including transitions to doubly excited (bound-free and free-free) states is calculated for the soft X-ray region. Empirical relations applicable to problems of X-ray heating are derived from a tabulation of (He)/ (H); it is demonstrated that this ratio is not constant at X-ray energies.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1971
- DOI:
- 10.1086/150851
- Bibcode:
- 1971ApJ...164..387B