Abstract
A conventional Jarrell-Ash 25-100 double monochromator has been improved for high sensitivity Raman spectroscopy. The improvements include 2360 1/mm holographic gratings, a special RCA C31034A photomultiplier detector and sample cells especially designed by us for low level of stray light. With this apparatus the very weak torsional gas phase Raman spectra of ethanes C 2H 6, C 2D 6 and CH 3CD 3 has been recorded. Careful monitoring of all experimental variables combined with an efficient data acquisition and processing system enables a signal/noise ratio similar to that obtained with an intracavity set-up. For C 2D 6 this is the first time the torsional spectrum is reported. Wavenumbers and relative intensities for these transitions are given.
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