Abstract
We have used an optical polarization heterodyne technique to measure the frequencies of two OCS lines, one near 5.3 μm and the other near 5.9 μm. These sub-Doppler measurements gave 56 533 766.125 ± 0.035 MHz for the 2ν2 + ν3P(16) transition and 50 627 632.013 ± 0.100 MHz for the 2ν3P(48) line. The P(16) measurement is in excellent agreement (20 kHz) with a new result obtained with an alternate technique by a group at the University of Bonn. The 2ν3 measurement was combined with other frequency measurements to produce an improved calibration table for the 2ν3 OCS band near 1700 cm−1. These and other sub-Doppler frequency measurements in different spectral regions give improved frequencies for a number of OCS bands. These new frequencies will soon be incorporated into calibration data that will be available over the Internet.
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