A Theoretical Survey of the Radiation Chemistry of Water and Aqueous Solutions

Dewhurst, H. A.; Samuel, Aryeh H.; Magee, John L.

doi:10.2307/3570180

Cited by 48 publications

(14 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…From the point of view of the chemical reactivity, the solvated electron is a very strong reducing species [28][29][30][31][32][33][34][35][36]. Recombination of the e − aq with positive ions and radicals are produced inside volume elements called spurs, in radiation chemistry.…”

Section: Mechanismmentioning

confidence: 99%

See 1 more Smart Citation

Building micro and nanosystems with electrochemical discharges

Wüthrich

Allagui

2010

Electrochimica Acta

View full text Add to dashboard Cite

Section: Mechanismmentioning

confidence: 99%

“…2 [28][29][30][31][32][33][34][35][36] and also included the time scale at which the various reactions are happening.…”

Section: Mechanismmentioning

confidence: 99%

Building micro and nanosystems with electrochemical discharges

Wüthrich

Allagui

2010

Electrochimica Acta

View full text Add to dashboard Cite

“…is not a true rate constant as it will vary with time. I n the case of extreme correlations between like particles k 1 2 in equation [I] and [2] is i~iitially much greater than the kinetic theory rate constant for the reaction H + 013 --, I-120. This is of interest i l l coiincction with tlie isotope effect wlicre in section 10 we suggested that k l z was larger for the reaction D + O D -, D?O than it was for H + OI-I --, I-120.…”

Section: A Criticishl O F T H E Mathematical Construction O F T H E Mmentioning

confidence: 99%

“…In their secoild p~iblication (15b) Kelly, Rigg, and Weiss suggest that kl/k3= 2 Two tacit assumptions have been made in this clisc~~ssion, firstly that hytlrogen and deuterium atoms are producecl, "statistically", \vith equal probability from an HDO molecule ancl seconcll~~ that no exchange reactions of the type 1-1 + IHD + H:! + D occur in the track when scavengers are present.…”

Section: [81mentioning

confidence: 99%

“…Conseq~iently, both species of radicals have initially a similar spatial distribution; some of these radicals recombine t o give molecular products, others escape by diffusion into the bulk of the solution where they can be detected by their reactions as radicals. Several variations of this model are discussed by Dewhurst, Samuel, and Magee (2).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Kinetics of Radical Reactions in the Tracks of Fast Electrons. A Detailed Study of the Samuel–magee Model for the Radiation Chemistry of Water

Dyne¹,

Kennedy²

1958

Can. J. Chem.

View full text Add to dashboard Cite

The kinetic behavior of a 7-ray spur produced in water, having H and OH radicals distributed spatially in the manner suggested by Samuel and Magee, has been studied using an electronic computer. The variation in yield of the molecular products Hz, H20Z, and H?O with rate constants, diffusion constants, and spur size has been obtained. The model gives agreement with experiment choosing spurs with a small "radius" of the order of 10 A. On simple assumptions, however, the modcl predicts no difference in the molecular yields between heavy and light water and no isotopic separation in the formation of molecular hydrogen from isotopically enriched light water. Various special assumptions needed to give agreement with experiment for thcse isotope effects are discussed. The observed isotopicseparation in theformation of molecular hydrogen is attributed to the preferential dissociation of an H atom from an excited HDO molecule. I t is found that the yield of molecular hydrogen is less sensitive t o the presence of scavengers than the yield of hydrogel1 peroxide. INTRODUCTIONThe products of the radiation decomposition of water are of two types, free radicals and molecules, and it is generally supposed that the molecular products (hydrogen and hydrogen peroxide) are formed by recombination of free radicals (H and OH) in regions of high radical concentration. In the model of this process proposed by Samuel and Magee (I) it was suggested that the radicals were formed by the dissociation of excited water molecules. Conseq~iently, both species of radicals have initially a similar spatial distribution; some of these radicals recombine t o give molecular products, others escape by diffusion into the bulk of the solution where they can be detected by their reactions as radicals. Several variations of this model are discussed by Dewhurst, Samuel, and Magee (2).While this model has been widely accepted for the interpretation of the radiation chemistry of water no detailed study of its properties has been made in which the recombination of both reacting species (H and OH) is treated. As the kinetics of recombination and diffusion cannot be handled analytically the majority of calculations hitherto have been performed on a simplified version, a "one radical" model in which the one species has the "average" properties of H and OH. These calculations have shown that the model explains many of the features of the radiation decoinposition of water and on this pragmatic basis the model has been accepted.We have surmountecl the main obstacle to the study of a two-radical model, the intractable nature of the equations, by programming the problem for numerical solution on the Chalk River Datatron Computer, and this paper presents the results of these calculations. A secoild, equally serious, obstacle remains and this is our lack of kno~vledge about the rate constants and diffusioil constants and other parameters of the system. We have, accordingly, adopted an approach which is essentially the converse of that of experimental chemical...

show abstract

Effect of radiation on organic compounds

Burton¹,

Chang²

1960

Cancer

View full text Add to dashboard Cite

A Theoretical Survey of the Radiation Chemistry of Water and Aqueous Solutions

Cited by 48 publications

References 1 publication

Building micro and nanosystems with electrochemical discharges

Building micro and nanosystems with electrochemical discharges

The Kinetics of Radical Reactions in the Tracks of Fast Electrons. A Detailed Study of the Samuel–magee Model for the Radiation Chemistry of Water

Effect of radiation on organic compounds

Contact Info

Product

Resources

About