Abstract
Kapitza-Dirac scattering of a two-level atom is studied in Raman - Nath approximation without any restriction on the value of resonance detuning. The subject of interest, atom scattering amplitude, is obtained in form of a definite integral and is generalised in case of quantum superposition of initial momentums. It is shown that the discrete Gaussian form of the latter yields promising diffraction spectrum for the atom interferometry.
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