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Coherence transfer between rotation-inversion transitions in the ν3 fundamental of NH3

✍ Scribed by Steven A. Henck; Kevin K. Lehmann

Book ID
103029718
Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
465 KB
Volume
144
Category
Article
ISSN
0009-2614

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✦ Synopsis

The study of the absorption profile of the uI 'R 44 and pP SB lines of ammonia at various pressures is reported. The two lines of the observed inversion doublets broaden as the pressure is increased until they overlap. Once the lines have overlapped the spectral profile narrows and then begins to broaden again but at a markedly different rate. This effect is due to collisions which transfer coherence (often called cross relaxation) between the transitions of the given inversion doublets. Modeling of this effect shows that the rate of coherence transfer is 71% and 75% of the total collisional dephasing rate for the 'R 4, and pP S8 lines, respectively.

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Pressure-Broadening and Cross-Relaxation Rates of Rotation–Inversion Transitions in the ν4Band of NH3Perturbed by CO2
✍ H. Aroui; A. Picard-Bersellini; M. Chevalier; M. Broquier; S. Gherissi 📂 Article 📅 1996 🏛 Elsevier Science 🌐 English ⚖ 148 KB

Measurements of pressure-broadening and cross-relaxation rates of rotation-inversion transitions in the n 4 band (1470-1600 cm 01 ) of NH 3 perturbed by CO 2 are reported. Pressure-broadening parameters were measured at a low pressure of CO 2 (0-180 Torr). At high pressure, the two lines of the doub