Paper by Dr Shearer and S. Law on the cover of J. Phys. B

Last updated June 6, 2017 by Andrew Brown

The Kelydsh model originally developed for long periodic laser pulses is extended to consider direct photodetachment of negative ions with half-filled np3 valence shells by few-cycle laser pulses. The theory is applied to study above threshold detachment of Si ions by intense infrared femtosecond pulses. Photoelectron momentum maps of the direct electrons are found to exhibit a distinctive structure of concentric elliptical rings whose separation is dependent on the quantized frequency components of the few-cycle laser pulse. Angular distributions exhibit threshold effects associated with ponderomotive potential induced channel closings. Interference effects in the energy spectra are observable as multiphoton peaked structures whose positions are dependent on the threshold shifts determined by the laser vector potential. Additionally CEP effects manipulate all emission spectra, thus providing a critical tool for controlling the detachment process.
Photodetachment of Si by mid-infrared few-cycle femtosecond laser pulses


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