The rovibrational intensities of the 2 nu(3) band of (COO)-C-12-O-16-O-18 at 4639 cm(-1)

The absolute intensities of transitions in the 2 mu(3) vibrational band of (COO)-C-12-O-16-O-18,at 4639.5 cm(-1) have been measured in natural isotopi c abundance; the spectra were obtained with 0.012 cm(-1) resolution using t he McMath Fourier transform spetrometer of the National Solar Observatory l ocated at Kitt Peak National Observatory. About 70 transitions have been fi tted with an rms deviation of approximately 1.5% to obtain the rotationless band strength of S-vib(0) = 1.442 x 10(-23) molecule(-1) at 296 K along wi th a small first-order Herman-Wallis parameter of A(1) = 3.5 x 10(-5); high er order Herman-Wallis parameters could not be determined. The measured lin e positions, obtained using the CO2 gas samples in the range of 45-65 Torr at room temperature, confirm the current HITRAN tabulated values. The inter nal precision of our intensity measurements is very high, and the uncertain ty due to possible systematic errors is judged to be less than +/- 3%. (C) 1999 Elsevier Science Ltd. All rights reserved.