Alignment-Dependent Ionization of N${}_2$, O${}_2$, and CO${}_2$ in Intense Laser Fields

Abstract

The ionization probability of N${}_2$, O${}_2$, and CO${}_2$ in intense laser fields is studied theoretically as a function of the alignment angle by solving the time-dependent Schrödinger equation numerically assuming only the single-active-electron approximation. The results are compared to recent experimental data [D.~Pavi{č}i{ć} et al., Phys.\,Rev.\,Lett.\ {\bf 98}, 243001 (2007)] and good agreement is found for N${}_2$ and O${}_2$. For CO${}_2$ a possible explanation is provided for the failure of simplified single-active-electron models to reproduce the experimentally observed narrow ionization distribution. It is based on a field-induced coherent core-trapping effect.

5 pages, 2 figures

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