Heterogeneous vibrational relaxation of carbon monoxide

Grigorian, G. M.; Cenian, Adam

doi:10.1039/c3cp00040k

Cited by 2 publications

(1 citation statement)

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“…Following [20] and due to the lack of experimental data, we chose as default value of deactivation probability, γ v , for any mode of CO 2 being deactivated to the ground state, γ v (CO 2 (v > 0)) = 0.2, for a Pyrex surface (average value from table 1 of [63]). We use a constant value of 4 × 10 −2 for the deactivation probability for all levels of CO [63], which is significantly lower than for CO 2 , as measurements showed that the probabilities of heterogeneous relaxation of CO do not depend on the value of v, at least for v = 1, 2 and 3 [64]. A certain dependence on the vibrational level could be expected, similar to the case of N 2 , where a linear dependence of γ v with the vibrational level is reported [65,66].…”

Section: Vibrational Quenching On the Wallmentioning

confidence: 99%

Study of vibrational kinetics of CO₂ and CO in CO₂–O₂ plasmas under non-equilibrium conditions

Fromentin

Silva

Dias

et al. 2023

Plasma Sources Sci. Technol.

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This work explores the effect of O2 addition on CO2 dissociation and on the vibrational kinetics of CO2 and CO under various non-equilibrium plasma conditions. A self-consistent model, previously validated for pure CO2 discharges, is further extended by adding the vibrational kinetics of CO, including electron impact excitation and de-excitation (e-V), vibration-to-translation relaxation (V-T) and vibration-to-vibration energy exchange (V-V) processes. The vibrational kinetics considered include levels up to v = 10 for CO and up to v1 = 2 and v2 = v3 = 5, respectively for the symmetric stretch, bending and asymmetric stretch modes of CO2, and accounts for e-V, V-T in collisions between CO, CO2 and O2 molecules and O atoms and V-V processes involving all possible transfers involving CO2 and CO molecules. The kinetic scheme is validated by comparing the model predictions with recent experimental data measured in a DC glow discharge, operating at pressures in the range 0.4 - 5 Torr (53.33 - 666.66 Pa). The experimental results show a lower vibrational temperature of the different modes of CO2 and a decreased dissociation fraction of CO2 when O2 is added to the plasma but an increase of the vibrational temperature of CO. On the one hand, the simulations suggest that the former effect is the result of the stronger V-T energy-transfer collisions with O atoms which leads to an increase of the relaxation of the CO2 vibrational modes; On the other hand, two main mechanisms contribute to the lower CO2 dissociation fraction with increased O2 content in the mixture: the back reaction, CO(a3Πr) + O2 → CO2 + O and the recombinative detachment O- + CO → e + CO2.

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