Abstract
The rigid behaviour of a crystal lattice submitted to sudden and localized events (such as emission, absorption and scattering of quanta and/or light particles) is currently treated in terms of the well known Debye–Waller expression. Starting from first principles, and referring to solids described according to the Debye model, we present here a rigorous and general expression of the fraction of recoilless events, of which the Debye–Waller form is shown to represent only a first approximation, holding in the case of very low temperature solids.
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