Abstract
We investigate the atomic scattering from a standing-wave light beam in the Bragg regime. Here momentum conservation requires the scattering to flip between two allowed directions only. In this limit an adiabatic approximation allows us to obtain analytic expressions for the flipping. The various orders of such resonances are compared with the multiphoton resonances observed in radio-frequency spectra, when they are interpreted in terms of Dopplerons. In addition to the main frequency of flipping, we find a modulation of the whole beam, which is seen when the scattered beam interferes with some differently prepared component of itself. We integrate the coupled equations numerically and find that the adiabatic approximation gives a good description of the processes over a large range of parameter values.
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