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Fast Vibrational Relaxation of OH (Ņ=9) by Ammonia and Ozone



S A. Nizkorodov, W W. Harper, David Nesbitt


Vibrational removal of OH(X2II) out of v=9 by 03 and NH3 has been studied in a flow cell flash-photolysis apparatus using high-resolutiondirect infrared absorption detection of OH in the v=11 <- 9 band. Removal of OH (v=9) by 03 occurs with a nearly gas-kinetic rate ( k 03 = 1.37(15)x10-10 cm3/S). Collisional removal by NH3 proceeds at an even faster rate (k NH3 =7.60(50)x10-10 cm3/S) that is two to threetimes higher than the hard-sphere collision limit, suggesting a resonant V-V energy transfer induced by long-range dipole-dipole interactions. A conservative upper limit of 5x10-14 cm3/s is placed on the relaxafion of OH(v=9) by argon.
Chemical Physics Letters
No. 1-2


hydroxyl ammonia, kinetics, ozone, resonant energy transfer, vibrational relaxation


Nizkorodov, S. , Harper, W. and Nesbitt, D. (2001), Fast Vibrational Relaxation of OH (&#325;=9) by Ammonia and Ozone, Chemical Physics Letters (Accessed April 20, 2024)
Created May 31, 2001, Updated October 12, 2021