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

Published

June 1, 2001

Author(s)

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

Abstract

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.

Citation

Chemical Physics Letters

Volume

341

Issue

No. 1-2

Pub Type

Journals

Keywords

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

Citation

Nizkorodov, S. , Harper, W. and Nesbitt, D. (2001), Fast Vibrational Relaxation of OH (&#325;=9) by Ammonia and Ozone, Chemical Physics Letters (Accessed October 13, 2025)