The role of near resonance electronic energy transfer on the collisional quenching of NO (A2+) by C6H6 and C6F6 at low temperature
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2017 Elsevier B.V. We present measurements of the collisional fluorescence quenching cross section of NO (A2+) by benzene and hexafluorobenzene at a series of temperatures using a custom built slow flow cell and a pulsed de Laval nozzle test cell. The measurements show a deviation from the common harpoon mechanism of collisional fluorescence quenching, specifically the large quenching cross section of 147 2 at 300 K measured for benzene which is not predicted by the harpoon mechanism due to the low electron affinity of benzene (1.5 eV). We speculate that the quenching of NO (A2+) by benzene and hexafluorobenzene occurs through near resonance electronic energy transfer from the NO A-state to the A-state of the quencher via a pseudo-emission process. The predicted T1/3 dependence of the cross section for this model is consistent with the experimental observations.
author list (cited authors)
Winner, J. D., West, N. A., McIlvoy, M. H., Buen, Z. D., Bowersox, R., & North, S. W.
complete list of authors
Winner, Joshua D||West, Niclas A||McIlvoy, Madison H||Buen, Zachary D||Bowersox, Rodney DW||North, Simon W