Determination of Line Intensities in the nu1 + nu3 Band of SO2 by Applying a Tunable Diode Laser Spectrometer.

Line intensities for 109 lines in the nu1 + nu3 band of 32SO2, 4 lines in the nu1 + nu3 band of 34SO2, and 7 lines in the nu1 + nu2 + nu3 - nu2 band of 32SO2 were determined in the spectral region between 2464 cm-1 and 2503 cm-1 by applying a high resolution tunable diode laser spectrometer. The transitions from the nu1 + nu3 band of 32SO2 cover the quantum number ranges 2 </= J" </= 48, 0 </= Ka" </= 16 for lines from all branches. For the majority of lines the line intensities determined from measurements in the pressure range below 10 Torr are slightly smaller compared to the data in the HITRAN 1996 database. Averaging all our experimental data for the nu1 + nu3 band of 32SO2 a value Si Exp. = (0.94 +/- 0.01) Si HITRAN 96 was obtained. Within the experimental uncertainties the deviations between our experimental data and the HITRAN data do not show any quantum number dependence. From our experimental data we deduce for 32SO2 an integrated nu1 + nu3 band strength of (55.7 +/- 0.4).10(-20) cm-1/(molecules/cm2). For lines from the nu1 + nu2 + nu3 - nu2 hot band the situation is similar compared to the cold band; i.e., a ratio Si Exp. = (0.95 +/- 0.06) Si HITRAN 96 was obtained. For the four very weak transitions from the nu1 + nu3 band 34SO2 the measured line intensities were larger compared to the HITRAN data (Si Exp. = (1.4 +/- 0.2) Si HITRAN 96). Copyright 1997 Academic Press. Copyright 1997Academic Press