All fundamental transition frequencies to the 25 lowest rotational levels of the ν3 band of HCN have been measured for the first time to our knowledge using a photoacoustic spectrometer consisting of an F-center laser, a photoacoustic absorption cell, and an infrared wavemeter. The 49 transitions were measured at an HCN pressure of only 20 mTorr and had an rms deviation of 0.002 cm−1 from the calculated values. Effects of pressure broadening and pressure shifts were examined. In addition, the techniques of intracavity photoacoustic spectroscopy and frequency-modulated photoacoustic detection have been demonstrated for studying transitions in this band at low pressure.
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German et al. (1981) studied this question.
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