Alfred G. Hopkins

A Raman Cell for Low Temperature Liquids

The difficulties in measuring exact vibrational frequencies of gases, liquids, and solids are well known. In spectra of gases rotational transitions occurring simultaneously with vibrational transitions increase the the complexity of the bands. In spectra of solids and liquids intermolecular interactions complicate the spectra or broaden the bands. To eliminate these interferences and to obtain exact vibrational frequencies, spectra of the desired molecules can be measured by isolating the molecules in an inert environment. The matrix isolation technique, which has received considerable attention in recent years, is a good example of this method.

Raman spectrum of CF4 in liquid-argon solution

Abstract Raman spectra of CF 4 in liquid-argon solutions have been measured and compared to spectra of the liquid and the gas. The Fermi doublet between ν 3 and 2ν 4 was investigated as a function of concentration, and changes in the Raman spectrum corresponded closely to those observed previously in the i.r. spectrum.