{"title":"Thermal Conversions of F\\ightleftarrowsM in Additively Colored KCl Crystals","authors":"M. Hirai, T. Matsuyama","doi":"10.1143/JPSJ.22.1005","DOIUrl":null,"url":null,"abstract":"The composition and decomposition of M centers in additively colored KCl crystals have been examined by the thermal procedures. When a crystal is kept at a temperature between 320°K and 480°K after quenching from about 870°K or after F light irradiation at room temperature, to produce excess M centers, the growth or bleaching of the M band is found to proceed in accordance with a bimolecular reaction, by which the F 2 model of the M center is supported. From the rate constant of the reaction the mean activation energies for the jump of an F center and for the dissociation of an M center are obtained as 0.94 ev and 1.11 ev, respectively. The binding energy of an M center is estimated as 0.18 ev from the mean value of those obtained from the temperature dependence of the thermal equilibrium constant for \\(F{\\rightleftarrows}M\\) and from the difference between the dissociation energy of an M center and the jump energy of an F center.","PeriodicalId":269857,"journal":{"name":"Tokyo Sugaku Kaisya Zasshi","volume":"124 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1967-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"7","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Tokyo Sugaku Kaisya Zasshi","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1143/JPSJ.22.1005","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 7
Abstract
The composition and decomposition of M centers in additively colored KCl crystals have been examined by the thermal procedures. When a crystal is kept at a temperature between 320°K and 480°K after quenching from about 870°K or after F light irradiation at room temperature, to produce excess M centers, the growth or bleaching of the M band is found to proceed in accordance with a bimolecular reaction, by which the F 2 model of the M center is supported. From the rate constant of the reaction the mean activation energies for the jump of an F center and for the dissociation of an M center are obtained as 0.94 ev and 1.11 ev, respectively. The binding energy of an M center is estimated as 0.18 ev from the mean value of those obtained from the temperature dependence of the thermal equilibrium constant for \(F{\rightleftarrows}M\) and from the difference between the dissociation energy of an M center and the jump energy of an F center.