Abstract
A one-dimensional model of ${\mathrm{H}}_{2}$ is used to examine the nonlinear behavior of a pair of electrons in the presence of intense laser fields and fixed nuclei. We present ionization rates of ${\mathrm{H}}_{2}$ at different frequencies and intensities of short intense electromagnetic pulses by solving exactly the time-dependent Schr\odinger equation for the above system as a function of internuclear distance. Anomalously high ionization rates are found at large critical internuclear separations, akin to similar results found previously in the one-electron molecule ${\mathit{H}}_{2}$${\mathrm{}}^{+}$. Independent one-electron and simultaneous two-electron ionizations are identified from the numerical simulations to occur at different intensities and frequencies. Field-induced barrier suppression models are shown to explain qualitatively the numerical results. \textcopyright{} 1996 The American Physical Society.
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