Resonant structure in doubly charged ion formation during multiphoton ionization of Sr and Ba atoms by infrared laser radiation
Abstract
Experimental investigations of resonant structure in doubly charged ion (A2+) formation were carried out during Sr and Ba atom ionization by infrared laser radiation (ω = 8400-9100 cm-1). It has been shown that in this case the mechanism of ion formation is a two-electron process - the ions are produced immediately from the neutral atoms. It has been found for the first time that the resonant structure in A2+ ion formation in such conditions is due to the excitation and ionization of neutral-atom mixed states. The atomic-state mixing in this case results from the Stark effect provided that the polarizability of these states is very high.
- Publication:
-
Journal of Physics B Atomic Molecular Physics
- Pub Date:
- October 2000
- DOI:
- 10.1088/0953-4075/33/20/304
- Bibcode:
- 2000JPhB...33.4243B