Resonances in multiphoton ionization of He at the KrF laser wavelength

D.H. Glass, P.G. Burke

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Multiphoton ionization rates have been calculated for He at the KrF laser wavelength of 248 nm and for laser intensities up to 6 × 1014W cm-2using the R -matrix Floquet method. For intensities above that at which channel closing takes place it is found that intermediate five-photon resonances with bound states strongly influence the total rate. In particular, the resonance between the ground state and the 1s2p 1 Postate is found to occur at a laser intensity of 5 × 1014W cm-2 . This resonance is investigated at several neighbouring wavelengths and its prominent nature, which is discussed in terms of a proposed nearby laser-induced degenerate state, should enable it to be observed experimentally.
Original languageEnglish
Article number407
Pages (from-to)1-14
Number of pages14
JournalJournal of Physixs B: Atomic, Molecular and Optical Physics
Issue number3
Publication statusPublished (in print/issue) - 14 Feb 2000


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