OBSERVATION OF VIBRATIONAL CIRCULAR-DICHROISM FOR OVERTONE TRANSITIONS WITH COMMERCIALLY AVAILABLE CD SPECTROMETERS

It is demonstrated that some commercially available circular dichroism spectrometers can be used to gather vibrational circular dichroism da ta associated with overtone transitions. By way of specific example, t he circular dichroism spectra of neat S-(-)-limonene and R-(+)-limonen e are measured in the region 800-600 nm. The observed spectral feature s correspond to the overtone bands Delta nu = 5 and 6 for CH-stretchin g motions. A discussion of the data is also given.