Abstract
Multiphoton ionization rates from the dressed $1s{\ensuremath{\sigma}}_{g}^{+}$ and$2p{\ensuremath{\sigma}}_{u}^{+}$ states of${\mathrm{H}}_{2}^{+}$ are calculated within the Floquet approach. For linearly polarized light, and parallel transitions, we determine ionization rates for a range of internuclear separations. A rich structure of multiphoton resonances has been found. These features are not reproduced by quasistatic field models. The values of ionization rates as well as their bond-length dependence are studied and compared with wave-packet calculations. Differences between results and reasons for discrepancies are discussed. Finally, we present plots of dressed-state wave-function densities in order to illustrate laser-induced orbital hybridization.
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