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Current interest in low frequency excitations in polymers and biopolymers has raised anew the long standing problem of stray light rejection in Raman spectrometers. We report here progress in an attempt to use a Fabry-Perot (FP) interferometer in tandem with a Spex double monochromator for high contrast. This combination has produced a useful improvement in contrast over the Spex alone, by a factor of about 200, while maintaining the throughput, about 50% of the Spex alone. The system was not optimal by any means and we describe results from an apparatus which is now undergoing considerable development.
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Schoen et al. (1979) studied this question.
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