Abstract

The R branch of the ν5ν4 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

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