A study of the absolute infrared intensity of ν3, absorption from vibrationally excited molecules, and the vapor pressure of UF6

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Abstract
Results are presented from laser diode studies of ν3 transition of UF6 in the 16 μm region using a very long optical path absorption cell. The ν3 Q‐branch and several individual rotational transitions have been recorded in the temperature range between 165 and 295 K. From the ν3 band contour analysis and the line intensity measurements, the vibrational band strength of the ν3 transition, S0V=710±120 km mole−1, was obtained. From absorption measurements of a UF6 sample in the cooled cell at pressures from 10−3 to 10−5 Torr, the vapor pressure curve of UF6 was extended to the temperature range down to 165 K. A new technique is described allowing us to obtain diode laser ’’survey’’ spectra over a range of 25 cm−1 by ’’mode scans.’’ This technique allows us to measure the changes in the band shape of ν3 as a function of temperature, and thus learn something about ’’hot band’’ absorption from vibrationally excited molecules.