Journal Articles (before-1995)

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Subject: search.filters.subject.Energy Partition

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    Energy Partition in the Photolysis of HI and of H2S
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (12), 1972) Oldershaw, G. A.; Porter, D. A.; Smith, A.
    Yields of nitrogen from reaction (1) were used to determine the initial kinetic energy of hydrogen atoms produced by photolysis of HI and H2S in the presence of N2O. H* + N2O->N2 + OH. (1) The results show that the proportion of excited (52P±) iodine atoms formed by photolysis of HI at 279 nm is 0.11 ±0.14, and that 90±10 % of the residual energy following photolysis of H2S at 248 nm appears in translation of H and SH.
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    Energy Partition in the y-Radiolysis of Gaseous H2S+N2, H2S+Ar and H2S+Xe Mixtures
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (10), 1972) Ahmad, M.; Huyton, D. W.; Woodward, T. W.
    Ionization measurements in H24-N2, H2S4-Ar, and H2S4-Xc mixtures arc used to determine apparent stopping power ratios for the mixtures, or “ energy partition parameters ”. The values found for H2S4- N2, H2S4-Ar, and H2S4-Xc are 0.20, 0.95, and 3.60 respectively, as compared to the calculated values of 0.82, 0.95, and 2.46. In H2S4-Ar mixtures a “Jesse effect ” is observed that increases the ion yield by 2 units, this effect being quenched out between stopping power fractions Z = 0.2-0.4. Measurement of sulphur yields in H2S4-N2 mixtures enables an energy partition parameter of 0.5 to be evaluated. The difference from the value obtained by ionization measurements being explained by a small “Jesse effect" In H2S4-Ar mixtures the sulphur yield G(S) was always >G(S) = 7.0 found in pure H2S and approached values as high as 24. The sulphur yield also increased between Z = 0.2 and 0.4 by twice the decrease in the ion yield. G(S) in H2S4-Xe mixtures never rises above 7.0, and the values can be justified by energy transfer from Xe* (G ~ 5.0) to H2S to give H2 4- S*, where S* is not a ground state S(3P) atom. No such simple mechanism will explain the results in H2S4-Ar mixtures. Butadiene was used as an SH and S(3P) scavenger, and the ratio of scavengeablc to non-scavengcablc sulphur in H2 4-Ar mixtures is similar to that in H2S i.e. ^43. In H2S4-Xc mixtures this ratio is ~3-4, and is explained by production of excited S atoms (S*), which react with H2S to give H2 and S2.