Abstract

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.

© 1981 Optical Society of America

Broadening of the ν₃ Lines of HCN Due to Argon, Carbon Dioxide, and Hydrogen Chloride*

Robert J. Thibault, Arthur G. Maki, and Earle K. Plyler
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Measurements on Higher J Rotational Lines of Vibration Rotation Bands and Study of Resonances in Linear Polyatomic Molecules. I. ν₂ and 2ν₂⁰ Bands of HC¹²N†

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