Abstract

The interplay between theory and experiment has stimulated the uncovering and understanding of a broad range of new phenomena in atomic and molecular photoabsorption processes, brought about by the advent of third-generation synchrotron light sources, on the experimental side, and vastly enhanced computing power on the theoretical. Among the examples of the new physics explored are nondipole effects in atoms and molecules at very low photon energies (tens or hundreds of eV) and the influence of many-body correlations on them, core level photodetachment of negative ions and the structure engendered by the photoelectron emerging through the charge cloud of the outer, loosely bound electrons, and the photoionization of confined atoms and ions trapped, e.g., in a C 60 cage, and the modifications to the photoionization cross section resulting from the confinement.

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