Abstract
The accepted threshold law for the photodetachment cross section may be written as , where is the lowest value of the angular momentum allowed the electron and is its momentum. This law presupposes that the forces in the final state are of finite range. In the present work, the effect of the long-range ( and ) multipole forces between the residual neutral atom and the outgoing electron on the threshold behavior is investigated. It is found that the behavior of the total cross section is changed to , where the coefficient is determined entirely by the long-range force. The effect of an potential is also found. In this case, even the leading term is altered from the standard form.
- Received 22 October 1964
DOI:https://doi.org/10.1103/PhysRev.137.A1668
©1965 American Physical Society