Threshold-Related Effects on the High Energy Plateau in Above-Threshold Detachment
نویسندگان
چکیده
We present results of a nonperturbative Floquet study of above-threshold detachment (ATD) of the H – and F – negative ions. Pronounced enhancements of ATD rates in the high-energy plateau region are found as the laser field intensity passes across ponderomotively shifted multiphoton thresholds. Depending on the symmetry of the initial state ( s or p symmetry), the enhancement is found to be most pronounced for evenor odd-channel closures, which is consistent with threshold laws applicable at the closing of particular multiphoton channels. Variations of ATD photoelectron angular distributions as functions of laser intensity near multiphoton thresholds are also investigated. PACS numbers: 32.80.Rm, 32.80.Gc DOI: 10.1134/S1054660X07040123 ż STRONG FIELD PHENOMENA
منابع مشابه
Threshold-related enhancement of the high-energy plateau in above-threshold detachment.
We present nonperturbative theoretical results showing a resonant-like enhancement of above-threshold detachment spectra in the region of the high-energy plateau as the laser intensity sweeps across channel thresholds. This enhancement has a pure quantum origin stemming from well-known threshold phenomena in multichannel problems whose features are clearly demonstrated in our numerical results....
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