Temperature dependence of the laser-enhanced reaction NO+O3 (001). II. Contributions from reactive and nonreactive channels

Ezra Bar-Ziv, Jerry Moy, Robert J. Gordon

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

The reaction NO+O3(001) was studied over the temperature range 158-437 K. A CO2 TEA laser was used to excite ozone in a rapidly flowing mixture of O3, Ar, and NO. The total decay rate of the laser-induced chemiluminescent signal showed a strong non-Arrhenius temperature dependence. This decay rate is the sum of contributions from three processes: the laser-enhanced luminescent reaction, the laser-enhanced nonluminescent reaction, and vibrational relaxation of O3(001) by NO. A kinetic model is proposed to determined each of the rate coefficients from the size and shape of the laser-induced signal. Our analysis shows that the rate coefficient of the laser-enhanced nonluminescent reaction has an Arrhenius form, with an activation energy that is lowered by approximately 1.6±0.4 kcal/mol. The rate coefficient for relaxation of ozone has a minimum at 225 K, suggesting that attractive forces are important in the nonreactive channel.

Original languageEnglish
Pages (from-to)1013-1021
Number of pages9
JournalJournal of Chemical Physics
Volume68
Issue number3
DOIs
StatePublished - 1 Jan 1978
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (all)
  • Physical and Theoretical Chemistry

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