Raman Spectrum of Neptunium Hexafluoride

Abstract

The three Raman active fundamentals of NpF₆ have been observed at ${\text{654 (ν}}_1)$ , ${\text{535 (ν}}_2)$ , and ${\text{208 cm}}^{\text{−1}}{\mathrm{(\nu }}_5)$ for the gas and at ${\text{651 (ν}}_1)\mathrm{p}$ , ${\text{524 (ν}}_2)\mathrm{dp}$ , and ${\text{218 cm}}^{\text{−1}}{\mathrm{(\nu }}_5)$ dp, for the liquid. The values observed for the gaseous sample were within 7 cm⁻¹ of the values calculated by Malm, Weinstock, and Claassen on the basis of infrared combination bands. Spectra were obtained through the use of a 6328‐Å He–Ne laser‐excited, photoelectric recording Raman spectrophotometer.