Product channels of the reactions of O2(b1Σg+)
| Autor: | A. M. Mebel, Michael C. Heaven, I.A. Medvedkov, Marsel V. Zagidullin, G. I. Tolstov, Valeriy N. Azyazov, N. A. Khvatov |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010304 chemical physics
Singlet oxygen Branching fraction Kinetics Analytical chemistry General Physics and Astronomy chemistry.chemical_element 010402 general chemistry Branching (polymer chemistry) 01 natural sciences Fluorescence Oxygen 0104 chemical sciences chemistry.chemical_compound chemistry 0103 physical sciences Molecule Physical and Theoretical Chemistry Recombination |
| Zdroj: | Chemical Physics. 521:85-91 |
| ISSN: | 0301-0104 |
| DOI: | 10.1016/j.chemphys.2019.01.025 |
| Popis: | Laser-induced fluorescence (LIF) experiments have been employed to evaluate the branching fractions for the product channels for O2(b1 Σ g + ) reactions with M = CO2, N2, H2, C2H4, N2O, H2O CH4 and I2 molecules. O2(b1 Σ g + ) was formed by exciting ground-state oxygen molecules with pulses from a tunable dye laser, and the kinetics were followed by observing the temporal profiles of the O2 b1 Σ g + − X3 Σ g - , O2 a1Δg − X3 Σ g - , and I2 A′3Π2u, A3Π1u − X1 Σ g + fluorescence signals. It has been found that O2(b1 Σ g + ) is quenched to O2(a1Δg) with a branching fraction 1.00 ± 0.05 for all tested molecules except iodine. The reaction of O2(b1 Σ g + ) with I2 has been found to have two dominant product channels, O2(X3 Σ g - ) + I2(A′3Π2u or A3Π1u) and O2(X3 Σ g - ) + 2 I(2P3/2) with branching fractions of 33 ± 7% and 67 ± 7%, respectively. Emission from I2(A′3Π2u or A3Π1u) molecules formed in recombination of iodine atoms in the gas phase was detected in the near IR. |
| Databáze: | OpenAIRE |
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