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Collision induced transitions of ammonia calculation of relaxation timesT1 andT2, line widths, line shifts, and the double resonance effect
K Tanaka J E Boggs S C Mehrotra
Atomic And Molecular Physics Volume 20 Issue 6 June 1983 pp 439-449
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https://www.ias.ac.in/article/fulltext/pram/020/06/0439-0449 -
Keywords
Relaxation time ;rotational energy transfer ;molecular-collisions ;line widths ;collision induced shift ;ammonia calculation ;double resonance effect -
Abstract
The longitudinal relaxation timeT1 and the transverse relaxation timeT3 for the inversion levels of the NH3 molecule have been calculated for NH3 — NH3, NH3 — N2 and NH3 — H2 collisions. The ratioT2/T1 lies between 1 and 2 which agrees well with the experiment. The phase shift effect onT2 and on the collisioninduced line shift δω under the framework of the Mehrotra-Boggs theory have also been evaluated. The change in the line intensity ΔI/I, in four-level double resonance experiments was also calculated, and the significance of higher order interaction terms has been pointed out.
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Author Affiliations
K Tanaka1 J E Boggs2 S C Mehrotra3
- Department of Chemistry, Faculty of Science, Kyushu University, Hakozaki, Fukuoka - Japan
- Department of Chemistry, University of Texas at Austin, Austin, Texas - 78712, USA
- Department of Physics, Marathwada University, University Campus, Aurangabad - 431 004, India
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Dates
- Published
- June 1983
- Manuscript received
- 3 July 1982
- Manuscript revised
- 7 March 1983
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Pramana – Journal of Physics
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