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
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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.
K Tanaka1 J E Boggs2 S C Mehrotra3
Volume 97, 2023
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