Pressure-Broadening and Cross-Relaxation Rates of Rotation–Inversion Transitions in the ν4Band of NH3Perturbed by CO2
Measurements of pressure-broadening and cross-relaxation rates of rotation–inversion transitions in the ν4band (1470–1600 cm−1) of NH3perturbed by CO2are reported. Pressure-broadening parameters were measured at a low pressure of CO2(0–180 Torr). At high pressure, the two lines of the doublet broade...
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| Published in | Journal of molecular spectroscopy Vol. 176; no. 1; pp. 162 - 168 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Inc
01.03.1996
Elsevier |
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| Abstract | Measurements of pressure-broadening and cross-relaxation rates of rotation–inversion transitions in the ν4band (1470–1600 cm−1) of NH3perturbed by CO2are reported. Pressure-broadening parameters were measured at a low pressure of CO2(0–180 Torr). At high pressure, the two lines of the doublet broaden as the pressure is increased, but with a markedly lower rate than at low pressure, until they overlap. Such an effect is due to collision cross-section relaxation between the two lines of the inversion components of the doublet. Detailed modeling of the spectral lines permits us to determine pressure-broadening coefficients for 41 transitions, and cross-relaxation parameters for 10 doublets. The results show a decrease of the pressure-broadening parameters with theJquantum number. We compared our results with other previous measurements obtained in the far-infrared and ν2regions, and for several foreign gases such as He, H2, and N2. |
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| AbstractList | Measurements of pressure-broadening and cross-relaxation rates of rotation–inversion transitions in the ν4band (1470–1600 cm−1) of NH3perturbed by CO2are reported. Pressure-broadening parameters were measured at a low pressure of CO2(0–180 Torr). At high pressure, the two lines of the doublet broaden as the pressure is increased, but with a markedly lower rate than at low pressure, until they overlap. Such an effect is due to collision cross-section relaxation between the two lines of the inversion components of the doublet. Detailed modeling of the spectral lines permits us to determine pressure-broadening coefficients for 41 transitions, and cross-relaxation parameters for 10 doublets. The results show a decrease of the pressure-broadening parameters with theJquantum number. We compared our results with other previous measurements obtained in the far-infrared and ν2regions, and for several foreign gases such as He, H2, and N2. |
| Author | Chevalier, M. Aroui, H. Broquier, M. Picard-Bersellini, A. Gherissi, S. |
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| Copyright | 1996 Academic Press Distributed under a Creative Commons Attribution 4.0 International License |
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| Snippet | Measurements of pressure-broadening and cross-relaxation rates of rotation–inversion transitions in the ν4band (1470–1600 cm−1) of NH3perturbed by CO2are... |
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| Title | Pressure-Broadening and Cross-Relaxation Rates of Rotation–Inversion Transitions in the ν4Band of NH3Perturbed by CO2 |
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