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 data associated with overtone transitions. By way of specific example, the circular dichroism spectra of neat S−(−)−limonene and R-(+)-limonene are measured in the region 800–600 nm. The observed spectral features correspond to the overtone bands Δ v = 5 and 6 for CH-stretching motions. A discussion of the data is also given.