Laser photolysis of ozone in the presence of ammonia: Vibrationally excited OH radicals

• Published in: Chemical physics letters 1988-01, Vol.143 (4), p.348-352
• Main Authors: Cheskis, S.G., Iogansen, A.A., Kulakov, P.V., Sarkisov, O.M., Titov, A.A.
• Format: Article
• Language: English
• Subjects: Atomic and molecular collision processes and interactions; Atomic and molecular physics; Exact sciences and technology; Physics; Scattering of atoms, molecules and ions
• ISSN: 0009-2614; 1873-4448
• DOI: 10.1016/0009-2614(88)87045-3

Vibrationally excited OH radicals were generated by 266 nm laser photolysis of ozone in the presence of ammonia. Temporal profiles of OH(ν=0, 1, 2) concentrations were directly monitored by LIF techniques at various NH 3 pressures. The total vibrational distribution of OH product in the reaction O ( 1D)+ NH 3→NH 2+OH was found to be much hotter than the statistical distribution- P(ν=0): P(ν=1): P(ν=2): P(ν=3)=0.20:0.32:0.34:0.14. Vibrational relaxation rate constants of (2.1±0.3)× 10 −11, (1.0±0.3)×10 −10 and (3.0±1.0)×10 −10 cm 3/s were measured for collisions of OH(1), OH(2) and OH(3) with NH 3.