Spectrum of Gaseous UCl4

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Abstract
The spectra between 4000 and 23 000 cm−1 of gaseous UCl4 have been obtained for the temperature range 950° to 1250°K. These spectra have been compared with those of single‐crystal UCl4 at 77°K and room temperature. Spectra of solid UCl4 were obtained over the temperature range 300° to 827°K in order to compare with the gas. In general, the molar absorptivities of the gas are a factor of 10 attenuated over the solid. The energy levels of the gaseous state do not shift appreciably with temperature but, in general, the spectrum of the gas is shifted to the red side of the high‐temperature solid spectra. With the exception of a general shift, the spectrum of the vapor is remarkably similar to that of the solid.