- Conference date: 3-8 Oct 1999
- Location: Monterey, California (USA)
Multiphoton ionization rates have been calculated for He at the KrF laser wavelength of 248 nm and for intensities up to using 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 state is found to occur at an intensity of This resonance is investigated at several neighboring wavelengths and its prominent nature, which is discussed in terms of a proposed nearby laser-induced degenerate state (LIDS), should enable it to be observed experimentally.
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