We present results of ultrafast vibrational transient-transmission, transient-grating and photon-echo experiments, performed with the infrared light of a free-electron laser on Si-H stretching vibrations in hydrogenated amorphous silicon. The observations indicate that the nature of the dynamics of the local stretching mode is quite different from that of the same mode in a crystalline environment.

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Journal J. Lumin.
van der Voort, M, Rella, C. W, van der Meer, A. F. G, Akimov, A. V, & Dijkhuis, J. I. (1999). Free-electron laser experiments on Si-H vibrations in a-Si: H. J. Lumin., 83-84, 183–186.