Multiphoton ionization of molecular hydrogen by single-cycle pulses
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Multiphoton ionization, first observed by N.B. Delone in 1965, has been a subject of intense studies ever since. In this paper we consider multiphoton ionization of molecules in the limit of subopticalcycle pulse duration. Moreover, we study the regime where the molecules are first prepared in a coherent vibrational superposition state, and then are subjected to sub-cycle laser pulses synchronized with respect to the phase of the coherent molecular motion. The present approach is based on the Keldysh formalism, which assumes that the final free electron's state is much more sensitive to the pulse than the bound initial wavefunction . We find that the ionization rate depends not only on the sub-cycle shape of the laser pulses, but also on the time delay between the arrival of pulses and molecular motion. 2009 Pleiades Publishing, Ltd.