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Theory for the photoacoustic response to x-ray absorption.

A microscopic theory is presented for the photoacoustic effect induced in solids by x-ray absorption. The photoacoustic effect results from the thermalization of the excited Auger electrons and photoelec­ trons. We explain the dependence of the photoacoustic signal S on photon energy and the proportionali­ ty to the x-ray absorption coefficient in agreement with recent experiments on Cu. Results are presented for the dependence of S on photon energy, sample thickness, and the electronic structure of the absorb­ ing solid.