By using tunable microwave sidebands added to GO-laser lines, we have made
more sub-Doppler heterodyne frequency measurements on OCS. Three new rotati
onal transitions have been measured for each of three absorption bands, 10(
0)0-00(0)0, 02(0)1-00(0)0, and 03(1)1-01(1)0. The absolute uncertainties of
the measurements are on the order of +/-25 kHz. New calibration tables are
given for the region 1860-1925 and 2020-2085 cm(-1) based on the most rece
nt OCS measurements. (C) 2000 Academic Press.