Line-Mixing Effects inQBranches of CO2
| Autor: | Franck Thibault, J. Walrand, G. Blanquet, Doucen Rl, B. Khalil, Jean-Michel Hartmann, R. Rodrigues |
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| Rok vydání: | 1997 |
| Předmět: |
Coupling
Physics Spectrometer Infrared Operator (physics) Relaxation (NMR) Parity (physics) Quantum number Atomic and Molecular Physics and Optics Spectral line Pressure range Dipole Nuclear magnetic resonance Physical and Theoretical Chemistry Atomic physics Total pressure Spectroscopy Mixing (physics) Line (formation) |
| Zdroj: | Journal of Molecular Spectroscopy. 186:256-268 |
| ISSN: | 0022-2852 |
| Popis: | A theoretical model based on the energy corrected sudden (ECS) approximation is used to account for line-mixing effects in infrared Q branches of parallel bands of CO2. Measurements have been made using a tunable difference frequency spectrometer system in a Pi-Pi transition: spectra of the 11(1)1II-- 01(1)0I Q branch near 3580.3 cm-1 have been recorded at room temperature for CO2-He and CO2-N2 mixtures in the 0.1-1 atm total pressure range. Comparisons of experimental and computed spectra prove the quality of the ECS approach. It is shown that the influence of line mixing on the shape of parallel Q branches is very weak and much smaller than in perpendicular transitions. This result is analyzed in detail and explained in terms of the effects of the vibrational angular momenta on the dipole transition moments and vector coupling coefficients involved in the relaxation operator elements. The effects of collisions of CO2 with N2 and He are compared and discussed. Copyright 1997 Academic Press. Copyright 1997Academic Press |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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