Energy transfer in polyatomic molecules. II. Relative catalytic efficiency for energy transfer to different vibrations to the same molecule

Autor:	Alfred Rene Jean Paul Ubbelohde, J. C. McCoubrey, R. C. Milward
Rok vydání:	1961
Předmět:	Chemical kinetics Heavy water chemistry.chemical_compound General Energy Deuterium chemistry Relaxation (NMR) Inorganic chemistry Polyatomic ion Physical chemistry Molecule Energy (signal processing) Catalysis
Zdroj:	Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences. 264:299-308
ISSN:	2053-9169 0080-4630
DOI:	10.1098/rspa.1961.0201
Popis:	Vibrations of sulphur dioxide show two separate relaxation times. Values of r 1 = 6.0 × 10 -8 s for the vibrations of 519 cm -1 and r 2 = 1.2 × 10 -6 s for the vibrations of 1151 and 1361 cm -1 have been derived from new ultrasonic measurements, in fair agreement with earlier work. Molecules studied as possible vibration-translation catalysts included ethane, ethylene, water, and n -hexane. No enhanced efficiency of energy transfer was observed with ethylene. Ethane and water molecules were found to be only moderately efficient catalysts; proportionally, they exert a greater effect for processes associated with r 1 . Deuterium oxide is found to be somewhat more efficient than water. n -Hexane is highly efficient for both the r 1 and r 2 relaxation processes of sulphur dioxide. These observations are discussed in relation to various mechanisms for the catalysis of energy transfer.
Databáze:	OpenAIRE
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