Abstract
Single and multiphoton detachment rates have been calculated for Na-using the R-matrix Floquet approach. In the low-intensity limit theresults are in agreement withother recent calculations of the totalphotodetachment cross section. At intensities of 1010 W cm-2 two-photon detachment rates are presented and similaritieswith earlier calculations in Li- are discussed. Three-photon rates arealso presented at this intensity and are compared and contrasted with thesingle-photon case since both involve resonance structure with 1Po symmetry. The influence of resonances such as the 4s21Se doubly excited state and excitations of the residualatom are also considered.
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