{"title":"Photochemical Hole Burning in the Soret Absorption Band of Zinc-tetrabenzoporphin Derivative by Two-photon Excitation","authors":"Martin Vacha, S. Machida, K. Horie","doi":"10.1364/shbs.1994.thf2","DOIUrl":null,"url":null,"abstract":"Line-narrowing spectroscopic techniques, such as site-selection spectroscopy (fluorescence line narrowing) and spectral hole burning, have, to our knowledge, so far failed to eliminate the effect of inhomogeneous broadening of optical transitions to the second and/or higher excited singlet electronic states (Soret absorption band) of porphin-type dyes in low temperature matrices, mainly due to: (1) Perturbations between different electronic states and resulting broadening of the homogeneous spectral bands [1], and (2) Increasing density of vibronic states with increasing transition energy and lack of correlation between individual states of different molecules. However, in a class of porphin derivatives - free-base and metallotetrabenzoporhines (TBP) - the former effects are substantially reduced. As a result, quasiline structure of S0-S2 transitions of ZnTBP in an Ar matrix [2], and later of ZnTBP in supersonic expansions [3] were observed. Further, fluorescence from S2 state of ZnTBP [2,4] and recently also of Zn-tetratolyl-TBP [5] and Zn-TPP [6] were reported.","PeriodicalId":443330,"journal":{"name":"Spectral Hole-Burning and Related Spectroscopies: Science and Applications","volume":"49 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Spectral Hole-Burning and Related Spectroscopies: Science and Applications","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1364/shbs.1994.thf2","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Line-narrowing spectroscopic techniques, such as site-selection spectroscopy (fluorescence line narrowing) and spectral hole burning, have, to our knowledge, so far failed to eliminate the effect of inhomogeneous broadening of optical transitions to the second and/or higher excited singlet electronic states (Soret absorption band) of porphin-type dyes in low temperature matrices, mainly due to: (1) Perturbations between different electronic states and resulting broadening of the homogeneous spectral bands [1], and (2) Increasing density of vibronic states with increasing transition energy and lack of correlation between individual states of different molecules. However, in a class of porphin derivatives - free-base and metallotetrabenzoporhines (TBP) - the former effects are substantially reduced. As a result, quasiline structure of S0-S2 transitions of ZnTBP in an Ar matrix [2], and later of ZnTBP in supersonic expansions [3] were observed. Further, fluorescence from S2 state of ZnTBP [2,4] and recently also of Zn-tetratolyl-TBP [5] and Zn-TPP [6] were reported.