INTENSITY DEPENDENCE OF RESONANCES PROFILES IN MULTIPHOTON PARTIAL DETACHMENT RATES OF H-

The influence of autodetaching states of H- upon the total and partial detachment rates of its ground state are considered. The R-matrix Flo quet method is used, in which the coupling of the ion with the laser f ield is described non-perturbatively. The laser field is varied over a range of intensities, while frequency ranges are chosen such that the lowest three even-parity autodetaching states of the ion are excited through a two-photon transition from the ground state. Total and parti al photodetachment rates are found to be highly sensitive to the laser intensity when the intensity is close to that associated with laser-i nduced degenerate states of the ion. A model is presented to support t his interpretation.