UPDATING OCS 2-NU-2 BAND FOR CALIBRATION PURPOSES

After our previous measurement of the OCS 2ν2 band, which was published by Tolonen et al. in J. Mol. Spectrosc.144, 18-26 (1990), a clear shift has been found in the OCS ν1 band, which was our initial calibration source. Because the lines of the 2ν2 band are widely used for calibration purposes, we decided to remeasure the band by calibrating it directly with the highly accurate 9.4-μm band of CO2. The new center of the OCS 2ν2 band is 1047.042051 cm-1 with an accuracy of ±6 × 10-6 cm-1. This value is in perfect agreement with the result from the global rovibrational analysis of OCS by Fayt et al. in J. Mol. Spectrosc.136, 233-266 (1986). The wavenumber list of the main band is given. The reliability of the calibration accuracy in a high-resolution commercial instrument Bruker IFS 120 HR is examined. © 1992.