O2(b1Σg+) Quenching by O2, CO2, H2O, and N2 at Temperatures of 300-800 K

M V Zagidullin; N A Khvatov; I A Medvedkov; G I Tolstov; A M Mebel; M C Heaven; V N Azyazov

doi:10.1021/acs.jpca.7b07885

O₂(b¹Σ_g⁺) Quenching by O₂, CO₂, H₂O, and N₂ at Temperatures of 300-800 K

J Phys Chem A. 2017 Oct 5;121(39):7343-7348. doi: 10.1021/acs.jpca.7b07885. Epub 2017 Sep 26.

Authors

M V Zagidullin^{1

2}, N A Khvatov^{1

2}, I A Medvedkov¹, G I Tolstov¹, A M Mebel^{1

3}, M C Heaven^{1

4}, V N Azyazov^{1

2}

Affiliations

¹ Samara National Research University , Samara 443086, Russia.
² Lebedev Physical Institute , Samara 443011, Russia.
³ Florida International University , Miami, Florida 33199, United States.
⁴ Emory University , Atlanta, Georgia 30322, United States.

PMID: 28892383
DOI: 10.1021/acs.jpca.7b07885

Abstract

Rate constants for the removal of O₂(b¹Σ_g⁺) by collisions with O₂, N₂, CO₂, and H₂O have been determined over the temperature range from 297 to 800 K. O₂(b¹Σ_g⁺) was excited by pulses from a tunable dye laser, and the deactivation kinetics were followed by observing the temporal behavior of the b¹Σ_g⁺-X³Σ_g^- fluorescence. The removal rate constants for CO₂, N₂, and H₂O were not strongly dependent on temperature and could be represented by the expressions k_CO2 = (1.18 ± 0.05) × 10^-17 × T^1.5 × exp[Formula: see text], k_N2 = (8 ± 0.3) × 10^-20 × T^1.5 × exp[Formula: see text], and k_H2O = (1.27 ± 0.08) × 10^-16 × T^1.5 × exp[Formula: see text] cm³ molecule^-1 s^-1. Rate constants for O₂(b¹Σ_g⁺) removal by O₂(X), being orders of magnitude lower, demonstrated a sharp increase with temperature, represented by the fitted expression k_O2 = (7.4 ± 0.8) × 10^-17 × T^0.5 × exp[Formula: see text] cm³ molecule^-1 s^-1. All of the rate constants measured at room temperature were found to be in good agreement with previously reported values.