Abstract
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 language | English |
|---|---|
| Article number | 407 |
| Pages (from-to) | 1-14 |
| Number of pages | 14 |
| Journal | Journal of Physixs B: Atomic, Molecular and Optical Physics |
| Volume | 33 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published (in print/issue) - 14 Feb 2000 |