Nonperturbative theory of double photoionization of the hydrogen molecule

Abstract

We present completely ab initio nonperturbative calculations of the integral and single differential cross sections for double photoionization of ${\mathrm{H}}_{2}$ for photon energies from $53.9\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}75.7\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. The method of exterior complex scaling, implemented with B-splines, is used to solve the Schr\"odinger equation for a correlated continuum wave function corresponding to a single photon having been absorbed by a correlated initial state. The results are in good agreement with experimental integral cross sections.