An experimental method for obtaining time resolved Raman spectra in shock wave experiments is described. A key aspect of this method is the use of optical fibers to transmit light from a pulsed laser to the sample and to transmit the scattered light to the recording equipment. Using this method we have measured changes in the A1(466 cm−1) Raman line of α-quartz shocked along the z axis to 60 kbar. For the same density compression, the line shifts under shock loading are considerably larger than under hydrostatic loading. Because shifts of the A1(466 cm−1) line in quartz are correlated with changes in the Si—O—Si bond angle, which, in turn, is the primary compression mechanism in quartz, the present results indicate the role of nonhydrostatic stresses on compression at the molecular level.
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Gustavsen et al. (1994) studied this question.
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