Abstract
We report on the multiphoton ionization and dissociation of hydrogen and deuterium molecules in intense (8\ifmmode\times\else\texttimes\fi{}${10}^{11--}$4\ifmmode\times\else\texttimes\fi{}${10}^{13}$ W/${\mathrm{cm}}^{2}$) laser fields. The investigations were performed with the second harmonics of two different laser systems, a 50-ps neodymium-doped yttrium lithium fluoride and a 10-ns neodymium-doped yttrium aluminum garnet laser. Measurements included energy-resolved photoelectron and mass spectroscopy. In addition, we report on a measurement of the dynamics of different above-threshold dissociation branching ratios for ${\mathrm{H}}_{2}^{+}$ and ${\mathrm{D}}_{2}^{+}$ over a wide range of laser intensities. Our results support the dressed-molecule picture at least qualitatively, but differences do exist with the quantitative predictions.
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