Abstract

The R branch of the ν₅–ν₄ difference band of acetylene, ¹²C₂H₂, is recommended as a calibration standard for the 100–200-cm⁻¹ region. The lines are split by l-type doubling into pairs with a 3:1 intensity ratio, but this can only be observed under high resolution. The position of the calculated maximum of each blended line contour is displaced by the l-type doubling from the accurately calculated wavenumber of the more intense component of each J pair, but not by more than one-fifteenth of the spectral slit width. It is recommended that values calculated from constants derived from high resolution mid-ir measurements be used for calibration.

© 1976 Optical Society of America

Rotation Lines of Hydrogen Chloride for Wavenumber Calibration of Far Infrared Spectrometers

A. R. H. Cole and F. R. Honey
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High-resolution methane ν₃-band spectra using a stabilized tunable difference-frequency laser system*

A. S. Pine
J. Opt. Soc. Am. 66(2) 97-108 (1976)