Electron capture reactions in mixtures of HBr and H2S

Nagra, Surjit S.

doi:10.1016/0146-5724(78)90092-4

Cited by 8 publications

(5 citation statements)

References 15 publications

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“…[6][7][8][9][10][11][12][13][14][15][18][19][20] The calculated equilibrium constants, K eq , are mostly in the range of 10 -21 -10 -22 cm 3 molecule -1 . The ratio of the equilibrium concentration of the vdW complex to that of electron acceptor is equal to…”

Section: Introductionmentioning

confidence: 99%

“…The only explanation that can be then applied is that electrons are accepted not by individual molecules but by van der Waals (vdW) complexes preexisting in all gaseous mixtures. [6][7][8][9][10][11][12][13][14][15][16] In this case the mechanism of the process is exactly the same as for single molecule and the concentration of the vdW complex is defined by the equilibrium constant of its formation (reaction 6).…”

Section: Introductionmentioning

confidence: 99%

“…However, there are a lot of cases where the third-order kinetics cannot be explained by the BB mechanism. The only explanation that can be then applied is that electrons are accepted not by individual molecules but by van der Waals (vdW) complexes preexisting in all gaseous mixtures. − In this case the mechanism of the process is exactly the same as for single molecule and the concentration of the vdW complex is defined by the equilibrium constant of its formation (reaction 6) where M denotes AB (homogeneous complex) or any other molecule (heterogeneous).…”

Section: Introductionmentioning

confidence: 99%

“…There is no straightforward way to measure the concentration of the vdW complex but the method developed by Stogryn and Hirschfelder based on using second virial coefficient is usually applied. − ,− The calculated equilibrium constants, K eq , are mostly in the range of 10 -21 −10 -22 cm 3 molecule -1 . The ratio of the equilibrium concentration of the vdW complex to that of electron acceptor is equal to …”

Section: Introductionmentioning

confidence: 99%

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Thermal Electron Capture in the Mixtures of Halocarbons and Environmental Gases

Rosa¹,

Szamrej²

1999

J. Phys. Chem. A

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The electron capture processes in the mixtures containing halocarbons (CHF 3 or CClF 3 ) and nitrogen have been investigated. Second-and third-order kinetics were observed in both cases. The electron interaction with van der Waals complexes CHF 3 ‚N 2 and CClF 3 ‚N 2 was invoked to explain this behavior and the corresponding rate constants have been determined. The values for two-body processes (5 × 10 -14 cm 3 molecule -1 s -1 -CHF 3 and 1.3 × 10 -13 cm 3 molecule -1 s -1 -CClF 3 ) are fully consistent with the literature data. The estimated rate constants for electron capture by van der Waals complexes are equal to 1.2 × 10 -10 and 2.4 × 10 -11 cm 3 molecule -1 s -1 for CHF 3 ‚N 2 and CClF 3 ‚N 2 , respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal Electron Capture in the Mixtures of Halocarbons and Environmental Gases

Rosa¹,

Szamrej²

1999

J. Phys. Chem. A

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“…In a previous paper1 we have proposed the following mechanism for electron capture by methyl bromide in an excess of hydrogen sulphide: Using the rate constant for reaction (3) crudely estimated from pulse radiolysis,2 the rate constant for electron capture by CH3Br at P~,s=500 torr was estimated to be 2 x 10-28 cm3.s-1.…”

Section: Introductionmentioning

confidence: 99%

Effect of electron scavengers on the gamma radiolysis of H²S-Ch³Br systems

Szamrej¹,

Chrząścik²,

Foryś³

1984

Radiation Effects

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Recent publications (1 4) have dealt with the effect of electron scavengers on the radiolysis of simple inorganic gaseous hydrides. We would like to present some results of a preliminary study on the radiolysis of gaseous H2S that are, in general, quite different from those above (14). Matheson C.P. grade H,S (99.7 %) was found to contain CO, (-0.2 %) and CS, (< 0.001 %) as impurities when checked by gas chromatography. A 3 m Poropaq Q column maintained at 65 "C, helium carrier gas, and thermal conductivity detection were used (5). After several freeze-pump-thaw cycles at-130 "C, the concentration of CO, was reduced to-0.005 %. Some of this H,S was irradiated to a dose of about 4 x lo2, eV g-l. After degassing at-196 "C, this H,S was found to contain-0.005 % CO, and no detectable amount of CS,. Radiolysis experiments with the pre-irradiated H,S gave identical results to the untreated H,S, and so the latter was used for the bulk of the work presented here. SF, and N,O (Matheson) were degassed several times by freeze-pump-thaw cycles at liquid nitrogen temperature and were used without further purification. Dosimetry was effected by ion current measurements in vessels similar to those described by Back et al. (6), the extrapolation method of Scott and Greening (7) being used to obtain saturation ion currents. The same vessels were also used as irradiation vessels, as were ordinary Pyrex vessels of similar geometry. All vessels were baked out at 400 "C, to a pressure of less than lo-' Torr prior to filling and irradiating.

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