| ROTATIONAL ENERGY TRANSFER MECHANISMS AND INTERMOLECULAR INTERACTIONS OF VIBRATIONALLY EXCITED $NH_{3}$ IN COLLISIONS WITH $NH_{3}$ AND AR FROM STATE RESOLVED IR-DOUBLE-RESONANCE EXPERIMENTS (1992) | |||||||||
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| Author Institution: Institut f\""{u}r Physikalische Chemie, der Universit\""{a}t G\""{o}ttingen; Institut f\""{u}r Physikalische Chemie, Massachusetts Institute of Technology. Ammonia can be regarded as a unique model system for the investigation of collisional energy transfer processes of polar symmetric top molecules. State resolved R-R and R-T energy transfer of vibrationally excited $NH_{3} (v_{2}=1$) in collisions with $NH_{3}$ and Ar has been measured in IR-double-resonance experiments with a tunable diode laser. A master equation analysis was used to convert the state resolved experimental data into average ``microscopic” state-to-state cross sections. In the present contribution the detailed set of state resolved rotational energy transfer data will be analysed with respect to theoretical scaling laws for individual state-to-state coefficients, ``propensity rules” for rotational energy transfer of polar molecules and intermolecular potential surface parameters of the two collision partners. | |||||||||
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