Far Infra-red Spectroscopy of Benzene Derivatives by Interferometry

Abstract

THE advantages of deriving spectra by Fourier transformation from observations with a Michelson interferometer have been discussed previously¹. Another feature, more recently developed, is that spectra covering a wide range can be recorded comparatively rapidly and without the difficulty of grating and filter changes associated with conventional far infra-red instruments. This has now been exploited in studies of benzene derivatives which can have vibrational bands extending throughout the far infra-red region. For these compounds, infra-red measurements in the region below 400 cm⁻¹ are complementary to Raman studies in extending and confirming assignments of the fundamental vibrational frequencies.