Abstract
We present sub-Doppler heterodyne frequency measurements on 10 rovibrational transitions of carbonyl sulfide (OCS) between 2894 and 2910 cm−1. The measurements were made using a CO overtone laser which had limited tuneability through the generation of microwave sidebands in a CdTe crystal. With this technique the laser frequencies were shifted to the desired OCS transition frequencies. The transition frequencies could be measured with uncertainties less than 30 kHz (Δν/ν = 3 × 10−10) by frequency offset-locking the CO overtone laser to combination frequencies of two saturation-stabilized CO2laser standards. The measured transition frequencies of OCS were combined with previous sub-Doppler, Fourier transform, and microwave measurements to recalculate improved calibration tables for the 1001–0000, 111e1–011e0, and 111f1–011f0 bands. These tables are suitable for the calibration of infrared spectrometers in the 87 THz region (near 2900 cm−1).
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