The Reactions of sulfur Atoms. IX. The Flash Photolysis of Carbonyl Sulfide and the Reactions of S(¹D) Atoms with Hydrogen and Methane

Photochemistry of a Volcanically Driven Atmosphere on Io: Sulfur and Oxygen Species from a Pele-Type Eruption

“…Considerable scatter in the measured low-pressure limiting rate coefficient (k 0 ) for this reaction exists in the literature, with the measured rates appearing highly dependent on the background temperature, gas composition, and assumptions about other sulfur vapor reactions. Our adopted room-temperature value of k 0 = 8 × 10 −30 cm 6 s −1 is intermediate between values given in Oldershaw (1972, 1973), Fowles et al (1967), and Nicholas et al (1979). The temperature dependence is assumed to parallel that of 2S + M → S 2 + M (reaction R203, see Table A3).…”

“…Plane and Helmer (1994) R203 2S M → S 2 k 0 = 5.0 × 10 −32 e (900/T ) Est. based on Fowles et al (1967), Basco and Pearson (1967), and Oldershaw (1972, 1973) …”

“…based on S + NaSO 2 R268 2S 2 M → S 4 k 0 = 4.0 × 10 −31 e (900/T ) Est. based on Fowles et al (1967), Nicholas et al (1979), and Oldershaw (1972, 1973) R269 The relative abundance of the constituents also changes when the atmospheric density changes. The column-integrated mixing ratios for our high-, moderate-, and low-density models are listed in Table I.…”

PHOTOLYSIS OF GROUP VI HYDRIDES: I. SOLID H2S, H2S2, AND D2S

“…Photolysis of H2S vapor ( A > 2 000 A) has been monitored by kinetic spectroscopy (1,2) and undoubtedly the primary process is Abstraction from the substrate and disproportionation of I-IS subsequently form H Z H + H2S + H2 + H S H S + I-IS + H 2 + S2 The activation energy of reaction [2] is uilltnomn. However, by con~parison lvith results for mercaptans (3) the value is liltely to be > 5 Itcal/inole, which would almost certainly preclude its occurrence a t 77 OK.…”

“…Reaction [2] has been exploited in gas phase electron spin resonance (e.s.r.) studies of the radicals I-IS or DS, in whic11 products of an electric discharge through Hz or water vapor mere mixed with H2S or D2S in specially designed spectrometer cavities.…”