International Journal for Radiation Physics and Chemistry最新文献_第2页

International conference on singlet oxygen and related species in chemistry and biology 单线态氧及其在化学和生物学中的相关物种国际会议

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90050-4

J.H. Baxendale

引用次数: 4

Determination of the characteristics of solvated electrons from optical absorption data 用光学吸收数据测定溶剂化电子的特性

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90008-5

A. M. Brodskiy, A. V. Tsarevskiy

引用次数: 4

A trigger generator to control a linear accelerator for pulse radiolysis 用于控制用于脉冲辐射分解的直线加速器的触发发生器

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90079-6

B.W. Hodgson, J.P. Keene

引用次数: 1

On the mechanism for phosphate-mediated increase of Cl2− yield in irradiated, neutral chloride solution 磷酸盐介导辐照中性氯溶液中Cl2−产率增加的机理研究

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90044-9

E. Wold, T. Brustad, M. Kongshaug

{"title":"On the mechanism for phosphate-mediated increase of Cl2− yield in irradiated, neutral chloride solution","authors":"E. Wold, T. Brustad, M. Kongshaug","doi":"10.1016/0020-7055(76)90044-9","DOIUrl":"10.1016/0020-7055(76)90044-9","url":null,"abstract":"<div>The effect of phosphate buffer components on the radiation induced oxidation of chloride to Cl2− is studied by pulse radiolysis. The yield of Cl2− in neutral phoshate-free 0.13 mol dm−3 NaCl solution is much lower than in the corresponding acidic solution (pH < 3), but increases rapidly with increasing chloride concentration. Addition of 0.2 mol dm−3 phosphate buffer (pH 6.8) to 0.13 mol dm−3 NaCl results in about a five-fold increased yield of Cl2− in N2-saturated solution, and about a 10-fold increase in N2O. At higher chloride concentrations, the total yield both in N2 and N2O is near that at pH 2 when G(Cl2−) is suggested to be equal to G(OH). The phosphate mediated enhancement of G(Cl2−) in neutral solution is suggested to be caused by a proton transfer from H2PO4− to the intermediate chloride oxidation product ClOH−. From the effect of H+ and phosphate on G(Cl2− we conclude that the rate of the proton donation is about 100 times slower than that for the direct reaction between protons and ClOH−.The results are discussed in the light of previously suggested mechanisms for radiation-induced oxidation of chloride.</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 6","pages":"Pages 699-705"},"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)90044-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80661569","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: 3

Molecular weight determination of irradiated polyisobutylene by N.M.R. techniques 核磁共振技术测定辐照聚异丁烯的分子量

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90047-4

A. Charlesby, J. Steven

引用次数: 9

The reaction of radiation-generated free radicals with cobalt(II) and cobalt(III) complexes containing macrocyclic ligands 辐射产生的自由基与含大环配体的钴(II)和钴(III)配合物的反应

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90042-5

A. Martin Tait , Morton Z. Hoffman , E. Hayon

{"title":"The reaction of radiation-generated free radicals with cobalt(II) and cobalt(III) complexes containing macrocyclic ligands","authors":"A. Martin Tait , Morton Z. Hoffman , E. Hayon","doi":"10.1016/0020-7055(76)90042-5","DOIUrl":"10.1016/0020-7055(76)90042-5","url":null,"abstract":"<div>The reactions of radiation-generated free radicals with complexes of cobalt(III) and cobalt(II) containing the tetradentate 14-membered macrocyclic ligands 5,7,7,12,14,14 - hexamethyl - 1,4,8,11 - tetraazacyclotetradeca - 4,11 - diene (4,11 - dieneN4), 5,7,7,12,12,14 - hexamethyl - 1,4,8,11 - tetraazacyclotetradeca - 4,14 - diene (4,14 - dieneN4), and 2,3,9,10 - tetramethyl - 1,4,8,11 - tetraazacyclotetradeca - 1,3,8,10 - tetraene (1,3,8,10 - tetraeneN4) have been studied in aqueous solution using pulse radiolysis. The cobalt(III) complexes can be reduced to cobalt(II) by eaq−, CO2− and (CH3)2<math><mtext>Z.</mtext><mtext>̇</mtext></math>COH with the rate constants of the reactions depending upon the nature of the macrocycle and the axial ligand coordinated to the metal center. The rate constants and transient spectra arising from the reactions of the cobalt(II) species with H atoms, CH3 radicals, and Br2− radicals have also been determined.</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 6","pages":"Pages 691-696"},"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)90042-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88554908","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: 11

Radiation mechanisms—VI.(1) electron addition to tetrahedral phosphorus 辐射机理——六。(1)四面体磷的电子加成

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90007-3

S. P. Mishra, M. Symons

引用次数: 3

Gas phase pulse radiolysis studies of excited states 激发态的气相脉冲辐射分解研究

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90058-9

Myran C. Sauer Jr.

引用次数: 0

Kinetic investigations of the radiophotoluminescence of frozen organic compounds. Tunneling mechanism of light emission 冷冻有机化合物的放射光致发光动力学研究。光发射的隧穿机制

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90074-7

V.V. Kulakov, Yu.A. Berlin, V.G. Nikol'skii

{"title":"Kinetic investigations of the radiophotoluminescence of frozen organic compounds. Tunneling mechanism of light emission","authors":"V.V. Kulakov, Yu.A. Berlin, V.G. Nikol'skii","doi":"10.1016/0020-7055(76)90074-7","DOIUrl":"10.1016/0020-7055(76)90074-7","url":null,"abstract":"<div>The main kinetic patterns of the radiophotoluminescence (RPL) of organic substances at 77 K have been studied. It was established that the kinetics of the long-lived RPL component is determined by the sum of two processes: monomolecular, corresponding to the spontaneous deactivation of the charges of the triplet molecules formed on recombination of charges, and quasi-monomolecular the kinetics of which is determined by the recombination of electroncation pairs. For a number of aliphatic substances at radiation doses of more than 1 Mrad it was possible to find quenching of RPL manifest in an appreciable change in the luminescent characteristics. From the experimental findings it may be concluded that the quenching observed is due to the free radicals formed in the course of radiolysis and which are effective electron acceptors. A theoretical model of RPL is proposed based on the concepts of the tunnelling mechanism of charge migration in the irradiated frozen organic substances. In examining the processes of paired recombination of spatially separated charges consideration was given to the role of the processes competing with them for capture of one of the components of the pair (electron) by free radicals. The model satisfactorily explains the experimentally observed hyperbolic character of the decay of the long-lived RPL component, the shortening of the duration of luminescence with a rise in the radiation dose and an absence of the effect of temperature on the kinetics of RPL.</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 3","pages":"Pages 313-314, in1-in2, 315-324"},"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)90074-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90433539","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: 5

Investigation of the effect of 60Co-γ radiation on single and polycrystalline polyethylene by broad line N.M.R. 60Co-γ辐射对单晶和多晶聚乙烯影响的宽线核磁共振研究

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90013-9

S. Rafi Ahmad, A. Charleżsby

{"title":"Investigation of the effect of 60Co-γ radiation on single and polycrystalline polyethylene by broad line N.M.R.","authors":"S. Rafi Ahmad, A. Charleżsby","doi":"10.1016/0020-7055(76)90013-9","DOIUrl":"10.1016/0020-7055(76)90013-9","url":null,"abstract":"<div>The broad line N.M.R. spectra of irradiated and unirradiated high density bulk (HD) and single crystals (SC) of polyethylene were found to give rise to two components, e.g. broad and narrow lines, attributed to crystalline and amorphous regions, respectively. An increase in the line width of the narrow component with radiation dose is more marked in bulk HD specimens, and is ascribed to crosslinking in the radiation-sensitive amorphous region; whereas no such increase is apparent for the SC specimen. Though there seems to be a slight increase in the second moment of the total absorption curve with radiation up to about 200 Mrad, both the second moment and the line width of the broad component was found to decrease with radiation dose for both the samples. This indicates an increased chain mobility in the crystalline regions and is considered to be due to the destruction of regularity in the crystal lattices by the combined processes of crosslinking (or endlinking) in the amorphous regions and the formation of lattice defects and imperfections by the ionizing radiation. A relatively faster decrease of line width with radiation dose above about 1000 Mrad may be attributed to the predominance of the latter process at high doses.</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 4","pages":"Pages 497-501"},"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)90013-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86049145","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: 6