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• W2022382857 abstract "Infrared emission has been recorded from a heated seeded supersonic primary beam of HCl or HF (1) prior to collision with a target beam, and (2) subsequent to that collision. Mean collision energy and collision partner were varied systematically. After correction for elastic scattering, the net population change due to inelastic scattering in a translation—rotation (T ↔ R) energy-transfer encounter was obtained for specific J states ranging from J = 0–16 of vibrational level υ = 1 of the primary-beam molecule. The broad picture is that a net transfer into low-J states out of higher-J states takes place at low collision energies, and the converse at high collision energies. These observations are interpreted in terms of the “exponential model” for the relative cross sections of T ↔ R inelastic collisions, SR (Ji → Jf), proposed earlier [J.C. Polanyi and K.B. Woodall, J. Chem. Phys. 56 (1972) 1563], modified here to satisfy microscopic reversibility. The constant C in the model, which governs the exponential decrease in SR with increasing energy difference ΔEJ between Jf and Ji, can be derived, as a function of collision energy T, from the present experimental data; C decreases as T increases, i.e. larger ΔJ become more probable. In order to check the validity of the model, it was compared with 3D trajectory results; according to this criterion it was found to give a very good representation of SR(Ji → Jf) with a single value for C, within a limited range of Ji. The collision partners HCl + HF exhibit anomalously efficient rotational deactivation; evidence is presented which indicates that at low collision energies this is due to resonant R → R transfer. Very efficient deactivation of HCl by HCl, at low collision energy, is likely to be due to V — V transfer." @default.
• W2022382857 created "2016-06-24" @default.
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• W2022382857 date "1975-08-01" @default.
• W2022382857 modified "2023-09-23" @default.
• W2022382857 title "Energy transfer as a function of collision energy. I Collision partners: Hydrogen halides + inert gases, hydrogen halides, H2S and propane" @default.
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• W2022382857 doi "https://doi.org/10.1016/0301-0104(75)85005-1" @default.
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