Surface vibrational modes of alpha-quartz(0001) probed by sum-frequency spectroscopy.
Infrared-visible sum-frequency spectroscopy was used to probe surface vibrations of alpha-quartz(0001) under ambient conditions. Two modes at 880 and 980 cm(-1) were observed and identified as arising from Si-O-Si and Si-OH structures of the surface. Heat treatment and hydroxylation could convert Si-OH to Si-O-Si and vice versa. The technique is generally applicable to studies of surface phonons of other oxides, semiconductors, and insulators.
Liu
Wei-Tao
WT
Physics Department, University of California at Berkeley, Berkeley, California 94720, USA.
Shen
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