International Journal for Radiation Physics and Chemistry最新文献_第10页

Thermoluminescence isothermal decay in γ-irradiated CaSO4 : Dy phosphors—kinetics, and distribution of trap depths γ辐照CaSO4: Dy磷的热释光等温衰减动力学及俘获深度分布

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90006-1

O. Fiorella, M. Mangia, E. Oliveri

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引用次数: 23

Pulse radiolysis of aqueous solutions of tetraphenylphosphonium ions 脉冲辐射解四苯基磷离子水溶液

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90017-6

H. Horii, S. Fujita, T. Mori, S. Taniguchi

{"title":"Pulse radiolysis of aqueous solutions of tetraphenylphosphonium ions","authors":"H. Horii, S. Fujita, T. Mori, S. Taniguchi","doi":"10.1016/0020-7055(76)90017-6","DOIUrl":"10.1016/0020-7055(76)90017-6","url":null,"abstract":"<div>The reactions of tetraphenylphosphonium ion (Ar4P+) with eaq−, H atoms and OH radicals have been investigated. The absorption spectra of three transient species were obtained. Ar4P· radicals formed by the reaction: Ar4P+ + eaq− → Ar4P· have a maximum absorption at 305 nm [ε305 = (9400 ± 300) dm3 mol−1 cm−1] and decays by second-order kinetics with the rate constant 2k = (2·7 ±0·4) × 109 dm3 mol−1 s−1. H atoms and OH radicals form transient adducts to the phenyl groups of the Ar4P+ ion with the rate constants of (1·5 ± 0·3) × 109 dm3 mol−1 s−1 and (3·0±0·3) × 109 dm3 mol−1 s−1, respectively. Both adducts have broad absorption spectra at 300≈380 nm (λmax = 340 nm) with the molar extinction coefficients ε340 = 5400±300 dm3 mol−1 cm−1 for the H adduct and ε340 = 3500±200 dm3 mol−1 cm−1 for the OH adduct.</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 4","pages":"Pages 521-522"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7055(76)90017-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88178588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Formation and role of excited states in radiolysis—A foreword 放射性溶解中激发态的形成和作用——前言

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90055-3

Ajit Singh

引用次数: 0

γ-radiolysis of myo-inositol hexasulphate (free acid) in aqueous solution 六硫酸肌醇(游离酸)在水溶液中的γ-辐射分解

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90021-8

M. Balakrishnan, W.J. Criddle, B.J. Jones

引用次数: 1

Luminescence de recombinaison consecutive a la photoionisation d'une solution organique vitreuse-nouvelle methode experimentale 有机玻璃溶液光离子化后的连续复合发光-一种新的实验方法

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90020-6

D. Ceccaldi

{"title":"Luminescence de recombinaison consecutive a la photoionisation d'une solution organique vitreuse-nouvelle methode experimentale","authors":"D. Ceccaldi","doi":"10.1016/0020-7055(76)90020-6","DOIUrl":"10.1016/0020-7055(76)90020-6","url":null,"abstract":"<div>In this paper, we describe a new experimental method which is used to determine the effect of temperature on the mechanisms related to the detrapping of electrons trapped in a glass. The studied samples are organic vitreous solutions of an aromatic molecule (TMPD) inside a non-polar glass (3-MP or MCH). The intensity of the isothermal luminescence (ITL) following the photoionization of the sample at 77K is increased when applying thermal jumps ΔT≲2K (the rise time is ⋍s).A general kinetical theory is used to explain the shapes of the luminescence curves perturbed by thermal jumps. It is shown that the experimental observations can be explained in terms of a slow diffusion of the trapped electrons towards a tunneling detrapping zone. When applying a thermal jump ΔT, the intensity of luminescence is multiplied by X such as: <math><mtext>X = </mtext><mtext>exp</mtext><mtext> </mtext><mtext>ΔT</mtext><mtext>T</mtext><mtext>E</mtext><mtext>kT</mtext><mtext>+ Y</mtext><mtext>1+Y</mtext></math>.This relationship is in good agreement with experience. The thermal detrapping activation energy E and the tunnelling effect ratio Y can be determined through this formula. The shapes of the kinetic curves at T = 77K and T = 77·50K are compared in the case of 3-MP glassy samples (near the glass transition, Tg = 77K). It is concluded that there is a slow diffusion of trapped electrons (as it was already shown); the diffusion activation energy (Ed = 0·65eV) is found to be very close to viscosity activation energy (E = 0·65eV) as given by Willard. This last result seems to support the hypothesis according to which the diffusion of trapped electrons is the consequence of the diffusion of the trapping cavities (at Tg).</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 5","pages":"Pages 539-548"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7055(76)90020-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73633173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Radiolysis of monocrystalline, liquid and aqueous solutions of methane sulphonic acid 甲烷磺酸单晶、液体和水溶液的辐射分解

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90036-X

T.E. Eriksen, J. Lind, T. Gillbro

{"title":"Radiolysis of monocrystalline, liquid and aqueous solutions of methane sulphonic acid","authors":"T.E. Eriksen, J. Lind, T. Gillbro","doi":"10.1016/0020-7055(76)90036-X","DOIUrl":"10.1016/0020-7055(76)90036-X","url":null,"abstract":"<div>A study of the radiolysis of monocrystalline, liquid and aqueous solutions of methane sulphonic acid is reported. E.S.R.-measurements on γ-irradiated single crystals show that two radicals ·CH2SO2(OH) and CH3ŻSO2(OH)− are formed. Sulphonic acid-water mixtures were investigated by pulse radiolysis. A short-lived transient absorption with maximum at 450 nm is assigned to the radical ion CH3ŻSO2(OH)− (ϵ = 1740 dm3 mol−1 cm−1). Two longer-lived transient absorptions at 263 and 347 nm in concentrated solution were shifted to 242 and 332 nm respectively with increasing water concentration.The 242/263 nm absorption is ascribed to the ·CH2SO3− radical and its protonated form and the 332/347 nm absorption to the CH3SO2· radical formed by the decomposition of the CH3ŻSO2(OH)− radical ion. The interpretation of E.S.R. and optical spectra is based on the assumption of a hydrogen bonding structure of the sulphonic acid.</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 6","pages":"Pages 655-659"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7055(76)90036-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75129986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Excitation in the radiation chemistry of inorganic gases 无机气体辐射化学中的激发

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90061-9

C. Willis, A.W. Boyd

引用次数: 151

Note from the editor-in-chief 总编辑注

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90053-X

A. Charlesby

引用次数: 0

Observation of excited states in the radiolysis of liquid hydrocarbons 液态烃辐射分解激发态的观察

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90056-5

J.K. Thomas

引用次数: 29

Reactions of OH radicals with tris(1,10-phenanthroline)iron(II) studied by pulse radiolysis 脉冲辐射解法研究羟基自由基与三(1,10-菲罗啉)铁(II)的反应

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90004-8

E. S. Floryan, P. Pagsberg

引用次数: 7