ISSN:
1434-6079
Keywords:
32.60. +i
;
32.80.W
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We have investigated ionization and excitation of the Ba 6s n s 1 S 0 and 6s n d 1,3 D 2 series in strong microwave fields. The observed microwave ionization threshold fields, scaling as 0.28n −5, and the state mixing fields cannot be completely explained in terms of a single cycle Landau-Zener model. However, by taking into account multiphoton resonant transitions driven by many cycles of the microwave field we have been able to interpet the data. In particular, multi-photon transitions have been found to be responsible for apparent resonance structures and for the unexpectedly low mixing fields. Not surprisingly, doubly excited valence states introduce irregularities into both the microwave ionization and the state mixing field values.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01438004
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