Temporary negative-ion states of Na, K, Rb, and Cs

Authors

• A.R. Johnston, University of Nebraska - Lincoln
• Paul Burrow, University of Nebraska - LincolnFollow

Document Type

Article

Date of this Version

January 1995

Comments

Published by American Physical Society. Phys. Rev. A, 51, 406 (1995). http://pra.aps.org. Copyright © 1995 American Physical Society. Permission to use.

Abstract

Electron-transmission spectroscopy is used to observe structure in the electron-scattering cross section associated with the formation of temporary negative ions and channel-opening effects. A strong ‘‘family’’ resemblance is apparent among the resonances of the alkali metals. From published calculations and angular scattering studies, the lower-lying features are known with some confidence. Based on these, plausible assignments for some of the higher-lying resonances are put forth. We propose that the absence of resonances near the Cs 5 ²D and possibly the Na 4 ²P and 5 ²P thresholds is associated with the negative polarizabilities of these excited states.