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The photo-induced translational dynamics of species solvated in helium nanodroplets has been investigated with a variety of spectroscopic techniques. It has been found that for some solutes the interaction between with the helium environment changes upon electronic excitations from attractive to repulsive. As a result, the excited species are ejected from the droplets. Using ion imaging techniques, the speed distributions of the ejected atoms or molecules have been determined. The relation of these speed distributions to the critical Landau velocity, the velocity below which no energy and momentum can be transferred from a moving object to the superfluid helium environment, will be discussed. In order to address the role of the surface region, similar experiments have been performed involving species located on the surface of the droplets. |
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