Infrared radio frequency double resonance spectroscopy of the 13CF4 ν3 fundamental using a tunable diode laser

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Abstract
Pure rotational spectrum of 13CF4 was investigated in the ν3 vibrational state by infrared–radio‐frequency double resonance. A frequency tunable semiconductor diode laser was used as an infrared pumping radiation source. About 100 radio‐frequency transitions among the ν3 tetrahedral fine structure splittings were measured with the accuracy of a few tens of kHz. The observed spectrum showed that the ν3 state of 13CF4, in particular the R = J+1 highest Coriolis sublevel, was largely perturbed by 2ν4 which was about 15 cm−1 above ν3. Seven tensor constants were determined tentatively from the transitions measured in the R = J and J−1 sublevels.