Simultaneous diffraction:<i>Umweganregung</i>peaks in the case of a vibrating single crystal

The positive diffraction intensity changes on forbidden (222) planes of a vibrating single crystal of Si, which are produced by simultaneous diffraction, are experimentally treated for the symmetric Laue case. The neutron diffraction experiment was performed for a flexurally vibrating as well as a non-vibrating perfect silicon bar. Several Umweganregung peaks were observed after exciting the bar into vibration while no Umweganregung peak was observed in the case of a non-vibrating crystal.

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