Hyper-Raman spectroscopy of alcohols excited at 532 nm: Methanol, ethanol, 1-propanol, and 2-propanol

Hyper-Raman (HR) measurements of four simple alcohols have been demonstrated. High-quality HR spectra with high signal to noise ratios allow us to discuss spectral features in detail. Measured HR spectra are compared with IR and Raman spectra. High similarities between HR and IR spectra are found both in the fingerprint and the CH stretching regions. Meanwhile, HR and IR spectra show differences in spectral features including relative intensities of the OH stretch to the CH stretches. Besides, the frequencies of the hydrogen-bonded OH stretching mode in HR spectra locate around 3,360 cm(-1), higher than those observed in IR spectra. These differences reflect the difference in the selection rules of spectroscopic methods.

Automated summary

The study demonstrated high similarities between Hyper-Raman (HR) spectra and IR spectra of simple alcohols, but differences were found in certain spectral features, including relative intensities of the OH stretch to the CH stretches. Additionally, the frequencies of the hydrogen-bonded OH stretching mode in HR spectra were higher than those observed in IR spectra, reflecting differences in the selection rules of spectroscopic methods.