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

Research output: Contribution to journalArticle


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.


External organisations
  • Max Planck Institute of Quantum Optics
  • University of Southern California
  • Saclay Nuclear Research Centre
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Atom and Molecular Physics and Optics
Original languageEnglish
Pages (from-to)6165-6179
Number of pages15
JournalPhysical Review A
Issue number12
Publication statusPublished - 1988 Dec 15
Publication categoryResearch
Externally publishedYes