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• W2005012784 abstract "The model of collision-induced deactivation of excited species proposed by Parmenter and co-workers has been examined in its application to the collisional quenching of PH2(Ã2A1). The correlation between the quenching efficiency and the molecular properties of the quenchers is seen to be closely obeyed only by rare gases and two molecules, H2 and CH4. The other molecular quenchers, conversely, show only a very loose trend of variation with the quantity εM−M, well depth of the potential between two molecules of the quencher M, which constitutes the basis for application of the Parmenter et al. model. This apparent limited validity of the Parmenter et al. correlation has been ascribed to the fact that the combining rule applied to the well depth εPH2*−M of the collision complex PH2*−M to express this quantity as (εPH2*−PH2*)1/2(εM−M)1/2 is applicable only to rare gases and not to most of the other quenchers. A procedure to find the charateristics of rare gas-like molecules with quenching efficiencies equal to those of the real quenchers has been proposed. A plot of the quenching data vs (εMh−Mh/k)1/2 of these hypothetical molecules Mh with the exception of NO, PH3, NH3, and H2S shows data points lying on the rare gas line. This indicates that the Parmenter et al. correlation is again verified and that the quenching mechanism of the corresponding real quenchers is the same as that of the rare gases. For NO, PH3, NH3, and H2S it has been demonstrated that chemical reactions should play an important role in the removal of PH2(Ã2A1), and the relative parts of physical and chemical quenchings have been evaluated. It has also been possible to determine the otherwise inaccesible quantity εPH2*−M, i.e., the well depth of the collision complexes, present in the original equation of the Parmenter et al. model. By plotting the quenching data vs εPH2*−M/k, it can be seen again that the Parmenter et al. model is followed by all the quenchers treated, except the above-mentioned molecules." @default.
• W2005012784 created "2016-06-24" @default.
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• W2005012784 date "2009-09-21" @default.
• W2005012784 modified "2023-09-26" @default.
• W2005012784 title "Collisional Quenching of Excited Electronic Species and the Parmenter et al. Correlation" @default.
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• W2005012784 doi "https://doi.org/10.1021/jp903503z" @default.
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