期刊
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
卷 50, 期 24, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6455/aa9621
关键词
helium doubly excited states; doubly resonant ionization; two-photon (two-colour) ionization; strong field; ab initio calculation
资金
- Slovenian Research Agency [P1-0112]
- European COST Action XLIC [CM1204]
We present an extended theoretical study of two-colour doubly resonant photoionization of helium involving two doubly excited states below the N = 2 ionization threshold. We model the effects of a strong laser coupling between the lowest P-1(o) and the selected S-1(e), P-1(e) and D-1(e) doubly excited states on the photoelectron (photoion) yield by taking into account the spatio-temporal structure of the pulses and by considering the effects of the neighbouring resonance states. We show that the laser coupling results in a measurable modification of the line profiles and in a reduction of the photoelectron yield under resonant or near-resonant conditions.
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