Molecular Attosecond Photoionization with Few Cycle XUV Laser Pulses

摘要

We present molecular attosecond ionization with few cycle XUV laser pulses from numerical solutions of time dependent Schr?dinger equations. Simulations performed on aligned H_2~+ exhibit signature of red-shifts in photoelectron energy spectra. This is shown to be critically sensitive to the the pulse duration and wavelength and is attributed to the broad spectral width of the ionizing pulses and diminishing electronic Franck-Condon factors with short pulses. We analyze the laser parameter dependence of the energy spectra by a perturbative model.