Stimulated Raman spectroscopy combined with vacuum ultraviolet photoionization: Application to jet-cooled methanol clusters as a new vibrational spectroscopic method for size-selected species in the gas phase

Stimulated Raman–vacuum ultraviolet-photoionization spectroscopy (SR–VUV-PIS) is developed for size-selected neutral molecular clusters in a supersonic beam, providing a new method with a wide applicability for systems without low-lying electronic chromophores. The method is demonstrated by observations of the CH stretching vibrations of bare methanol and the cluster species.