Low Frequency Raman Spectra of α-¹⁶O₂, α-¹⁸O₂, and α-N₂

Abstract

The low frequency Raman spectra of the 16 O 2 and 18 O 2 isotopes of oxygen have been compared in the α phase of the solid. The frequency of the line at 27 cm −1 is the same in both isotopes and this confirms its interpretation as due to spin wave or magnon excitation. The libron frequencies are lower in the 18 O 2 than in the 16 O 2 spectrum. The integrated relative intensity of the libron lines is smaller in the 18 O 2 spectrum.The observed α-N 2 spectrum confirms that reported by Anderson et al. The frequencies of the lines decrease and their half-widths increase as the temperature is raised to the α–β transition.