Excitation in the radiation chemistry of inorganic gases

Willis, C.; Boyd, A. W.

doi:10.1016/0020-7055(76)90061-9

Cited by 163 publications

(53 citation statements)

References 197 publications

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“…Wayne-Sieck et al 4 have shown that more than 80 % of radiolytic charged species are H + (H 2 O) n clusters. Willis et al 5 have determined the primary yields of the different radiolytic species. Kanda et al 6 have compared the formation velocities of non-radical species in dry and wet air.…”

Section: Introductionmentioning

confidence: 99%

Use of the point defect model to interpret the iron oxidation kinetics under proton irradiation

Lapuerta

Moncoffre

Jaffrézic

et al. 2007

Journal of Applied Physics

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This article concerns the study of iron corrosion in wet air under mega-electron-volt proton irradiation for different fluxes at room temperature and with a relative humidity fixed to 45%. Oxidized iron sample surfaces are characterized by ion beam analysis (Rutherford backscattering spectrometry and elastic recoil detection analysis), for the elemental analysis. The structural and physicochemical characterization is performed using the x-ray photoelectron spectroscopy and transmission electron microscopy techniques. We have also measured the iron oxidation kinetics. Radiation enhanced diffusion and transport processes have been evidenced. The modeling of the experimental data shows that the apparent oxygen diffusion coefficient increases whereas the oxygen transport velocity decreases as function of flux. Finally, the point defect model has been used to determine the electric field value in the samples. Results have shown that the transport process can be attributed to the presence of an electrical potential gradient

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Section: Introductionmentioning

confidence: 99%

Use of the point defect model to interpret the iron oxidation kinetics under proton irradiation

Lapuerta

Moncoffre

Jaffrézic

et al. 2007

Journal of Applied Physics

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“…3a is contradicted by the experimental results (blue circles) an obvious question is whether the ionization by gamma rays may produce sufficient H 2 SO 4 in the gas phase to replace the expected loss of ≈ 3-7% from the additional particles (estimated from numerical simulations). Each ionpair will on average [23,24] produce two OH molecules. Therefore with an ionization of 60 ion-pair cm −3 s −1 the production will be 120 molecules cm −3 s −1 .…”

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confidence: 99%

Response of cloud condensation nuclei (>50 nm) to changes in ion-nucleation

2013

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In experiments where ultraviolet light produces aerosols from trace amounts of ozone, sulphur dioxide, and water vapour, the number of additional small particles produced by ionization by gamma sources all grow up to diameters larger than 50 nm, appropriate for cloud condensation nuclei. This result contradicts both ion-free control experiments and also theoretical models that predict a decline in the response of larger particles due to an insufficiency of condensable gases (which leads to slower growth) and to larger losses by coagulation between the particles. This unpredicted experimental finding points to a process not included in current theoretical models, possibly an ion-induced formation of sulphuric acid in small clusters.

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“…The rate constants for these reactions are obtained primarily from the atmospheric chemistry literature (Willis & Boyd;1976, Bauich et al;, Demore et al, 1987and Atkinson et al, 1989), and were cross-checked with the NIST Database (NIST Standard Reference Data Base 17.0, 1994). The criterion for choosing the reactions was to consider reactions of neutral species having significant kinetic rate constants (> 1.0 x 10 7 cm 3 mole"'sec" 1 ).…”

Section: Section III Reaction Modelingmentioning

confidence: 99%