کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5427409 | 1508628 | 2017 | 12 صفحه PDF | دانلود رایگان |
- Cavity Ring Down spectroscopy of 18O enriched CO2 between 6977 and 7918Â cmâ1.
- 4243 transitions belonging to 59 bands of 16O12C18O and 16O12C17O are assigned.
- Thirty seven 16O12C18O and twelve 16O12C17O bands are newly assigned.
- Improved or new effective dipole moment parameters for ÎP=10-12 series of bands.
The room temperature absorption spectrum of 18O enriched carbon dioxide has been recorded by very high-sensitivity Cavity Ring Down spectroscopy between 6977 and 7918 cmâ1 (1.43â1.26 μm). The achieved sensitivity (noise equivalent absorption αmin ~8Ã10â11 cmâ1) has allowed for the detection of more than 8600 lines belonging to 166 bands of eleven carbon dioxide isotopologues. Line intensities of the weakest observed transitions are on the order of 2Ã10â30 cm/molecule.In this first part, we present the results relative to the 16O12C18O, 16O12C17O, 12C16O2 and 13C16O2 isotopologues. Their absorption lines were rovibrationally assigned on the basis of the predictions of their respective effective Hamiltonian model. Overall 5476 lines were measured and assigned to 93 bands. Forty nine of them, all belonging to 16O12C18O and 16O12C17O, are reported for the first time. The studied spectral region is formed by ÎP=10-12 series of transitions, where P=2V1+V2+3V3 is the polyad number (Vi are vibrational quantum numbers). The spectroscopic parameters of 58 bands of 16O12C18O and 16O12C17O were determined from a fit of the measured line positions. An inter- and an intrapolyad resonance perturbation were identified and analyzed in the 16O12C18O spectrum. The comparison with the line positions and line intensities included in the AMES line list is discussed.Global fits of the line intensities were performed in order to (i) improve the ÎP=10 and 11 sets of the effective dipole moment parameters of 16O12C18O and the ÎP=11 set of parameters of 16O12C17O and (ii) derive for the first time the ÎP=10 and 12 parameters of 16O12C17O and 16O12C18O, respectively.
Journal: Journal of Quantitative Spectroscopy and Radiative Transfer - Volume 187, January 2017, Pages 414-425