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Springer proceedings in physics

Some Odd Consequences of Self-coherence in the Photo-Diffraction and Photo-Absorption Processes

Calogero Renzo Natoli

Published Jan 1, 2021• 0 citations
Publisher
DOI
10.1007/978-3-030-72005-6_2

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We consider photo ionization of an atom which, due to passing through a diffraction grating, is prepared in a multi-site state possessing a periodic space structure with alternating maxima and minima. It has been found that this process qualitatively differs from photo ionization of a 'normal' atom. In particular, the spectra of emitted electrons and recoil ions in this process display clear one- and two-particle interference effects. Moreover, there are also striking differences between the momentum distributions of these particles, which no longer mirror each other. The origin of all these features is discussed in detail. It is also shown that the information about the diffraction grating, which is encoded in the multi-site state of the atom, can be fully decoded by exploring the spectra of recoil ions whereas the photo-electron spectra contain this information only partially.
A theoretical investigation is made of the self-diffraction of coherent light by excitons. It is shown that this is due to the non-Bose statistics of the excitons and is accompanied by the dynamic effects of interaction between the interference pattern and a light-induced holographic grating. It is suggested that dynamic self-diffraction may be used as a new efficient method of determining the optical parameters and visualizing crystal inhomogeneities in the exciton range of the absorption spectrum.