Self- and N2- broadening of CO in the low-pressure regime
| Autor: | Y. Tan, T.-P. Hua, J.-D. Tang, J. Wang, A.-W. Liu, Y. R. Sun, C.-F. Cheng, S.-M. Hu |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Journal of Physics: Conference Series. 2439:012007 |
| ISSN: | 1742-6596 1742-6588 |
| DOI: | 10.1088/1742-6596/2439/1/012007 |
| Popis: | Sub-Doppler saturated absorption spectroscopy of rovibrational transitions of carbon monoxide broadened by nitrogen was recorded at low pressures (1-24 Pa) near 1.56 µm with comb-locked cavity ring-down saturation spectroscopy. We found a nonlinear pressure dependence of the Lamb-dip width of the CO transition induced by elastic scattering. Analysis of the results allows us to characterize parameters of elastic- and nonelastic- scattering under collisions. The elastic scattering angle for nitrogen-induced collisions (CO-N2) was determined to be larger than 0.6 × 10−3 rad. The line broadening of the Lamb dip in the region of low pressures exceeds the broadening at high pressures by a factor of 4 and 5 for the self- and N2-broadening CO R(9) transition. Moreover, much smaller line shifts for both self- and N2-broaden Lamb dips were observed, which was also attributed to the decrease in the number of scattered molecules in the interaction and the increasing attracting forces. |
| Databáze: | OpenAIRE |
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