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Multiphoton spectroscopy of doubly excited, bound, and autoionizing states of strontium

Lambropoulos, P.; Tang, X. LU ; Agostini, P.; Petite, G. and Lhuillier, Anne LU (1988) In Physical Review A 38(12). p.6165-6179
Abstract

We present a theory attempting an interpretation of existing data on three- and four-photon ionization of Sr in the wavelength range 557-575 nm and at 532 nm. Two-photon resonances with bound excited states and three-photon resonances with doubly excited autoionizing states are studied. ac Stark shifts and broadening of resonances, as well as singlet-triplet transitions, are shown to yield interesting new information on atomic structure. The absorption of a fourth photon above the threshold leads to excited final ionic states, with autoionizing states having served as intermediate three-photon resonances. The calculation is based on a configuration-interaction scheme, with singlet-triplet mixing taken into account either through jl... (More)

We present a theory attempting an interpretation of existing data on three- and four-photon ionization of Sr in the wavelength range 557-575 nm and at 532 nm. Two-photon resonances with bound excited states and three-photon resonances with doubly excited autoionizing states are studied. ac Stark shifts and broadening of resonances, as well as singlet-triplet transitions, are shown to yield interesting new information on atomic structure. The absorption of a fourth photon above the threshold leads to excited final ionic states, with autoionizing states having served as intermediate three-photon resonances. The calculation is based on a configuration-interaction scheme, with singlet-triplet mixing taken into account either through jl coupling or phenomenologically by adjustment to some aspects of the data. The apparatus of resonant multiphoton theory is combined with the above scheme. Depending on the quantity in question, the agreement between theory and experiment ranges from good to semiquantitative.

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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review A
volume
38
issue
12
pages
15 pages
publisher
American Physical Society
external identifiers
  • scopus:0041185763
ISSN
1050-2947
DOI
10.1103/PhysRevA.38.6165
language
English
LU publication?
no
id
57ae9c98-e7b9-4da1-a48c-5cbef547267c
date added to LUP
2019-05-22 16:29:01
date last changed
2019-08-22 02:16:52
@article{57ae9c98-e7b9-4da1-a48c-5cbef547267c,
  abstract     = {<p>We present a theory attempting an interpretation of existing data on three- and four-photon ionization of Sr in the wavelength range 557-575 nm and at 532 nm. Two-photon resonances with bound excited states and three-photon resonances with doubly excited autoionizing states are studied. ac Stark shifts and broadening of resonances, as well as singlet-triplet transitions, are shown to yield interesting new information on atomic structure. The absorption of a fourth photon above the threshold leads to excited final ionic states, with autoionizing states having served as intermediate three-photon resonances. The calculation is based on a configuration-interaction scheme, with singlet-triplet mixing taken into account either through jl coupling or phenomenologically by adjustment to some aspects of the data. The apparatus of resonant multiphoton theory is combined with the above scheme. Depending on the quantity in question, the agreement between theory and experiment ranges from good to semiquantitative.</p>},
  author       = {Lambropoulos, P. and Tang, X. and Agostini, P. and Petite, G. and Lhuillier, Anne},
  issn         = {1050-2947},
  language     = {eng},
  month        = {12},
  number       = {12},
  pages        = {6165--6179},
  publisher    = {American Physical Society},
  series       = {Physical Review A},
  title        = {Multiphoton spectroscopy of doubly excited, bound, and autoionizing states of strontium},
  url          = {http://dx.doi.org/10.1103/PhysRevA.38.6165},
  volume       = {38},
  year         = {1988},
}