Resonant three-photon ionization of hydrogenic atoms by a non-monochromatic laser field

Citation
V. Yakhontov et al., Resonant three-photon ionization of hydrogenic atoms by a non-monochromatic laser field, J PHYS B, 32(7), 1999, pp. 1615-1637
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
ISSN journal
0953-4075 → ACNP
Volume
32
Issue
7
Year of publication
1999
Pages
1615 - 1637
Database
ISI
SICI code
0953-4075(19990414)32:7<1615:RTIOHA>2.0.ZU;2-N
Abstract
We present ionization probability and lineshape calculations for the two-st ep three- photon ionization process, 1S (2 (g) over bar omega) under right arrow, 2S ((h) over bar omega) under right arrow epsilon P, of the ground s tate of hydrogenic atoms in a non-monochromatic laser field with a time-dep endent amplitude. Within the framework of a three-level model, the AC Stark shifts and non-zero ionization rates of all states involved were taken int o account, together with spatial and temporal inhomogeneities of the laser signal. In contrast with the usual perturbative technique, the time evoluti on of the atomic states was simulated by directly solving the system of cou pled time-dependent inhomogeneous differential equations numerically, the e quations being equivalent to the appropriate non-stationary Schrodinger equ ation. Particular numerical results were obtained for typical parameters of the pulsed laser field that are employed in a new experiment to measure th e 1S-2S energy separation with muonium at the Rutherford Appleton Laborator y. The shifts and asymmetries of the photoionization lineshapes revealed ma y be of relevance for ultra-high-precision experiments in hydrogen in CW la ser fields.