Abstract：
:Absolute fluorescence quantum yields are reported for the rhodamine 6G cation and the fluorescein dianion dyes in nine solvents. This information is combined with previously reported fluorescence lifetimes to deduce radiative and nonradiative decay rates. Along the alcohol series from methanol to octanol, rhodamine 6G displays an increasing radiative rate, in parallel with the square of the refractive index increase, and a slightly decreasing nonradiative rate. Fluorescein is different: the apparent radiative rate actually decreases, suggesting that the emissive species is perturbed in some fashion. For both dyes, fluorescence yields are enhanced in D2O, rising to 0.98, in parallel with a corresponding increase in lifetimes. Protonated solvents invariably give shorter lifetimes and lower quantum yields, contrary to some previous speculation. From this work and an analysis of existing literature values, more precise values have been obtained for two previously proposed absolute quantum yield standards. The yield of fluorescein in 0.1 N NaOH(aq) is 0.925+/-0.015, and for rhodamine 6G in ethanol, it is 0.950+/-0.015. In both cases, the solutions are assumed to be in the limit of low concentration, excited close to their long-wave absorption band and at room temperature but may be either air-saturated or free of oxygen.
journal_name
Photochem Photobioljournal_title
Photochemistry and photobiologyauthors
Magde D,Wong R,Seybold PGdoi
10.1562/0031-8655(2002)075<0327:fqyatr>2.0.co;2subject
Has Abstractpub_date
2002-04-01 00:00:00pages
327-34issue
4eissn
0031-8655issn
1751-1097journal_volume
75pub_type
杂志文章abstract：:A novel type of circadian and photoperiodic control of the cell division cycle was found in photoautotrophic Euglena gracilis. When algae entrained to 24 h light-dark (LD) cycles (14 h L) were transferred to continuous darkness (DD) at the eighth hour of the final LD photoperiod, cell-cycle transition was arrested in ...
journal_title：Photochemistry and photobiology
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doi：10.1562/0031-8655(2002)076<0105:cgopoc>2.0.co;2
更新日期：2002-07-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
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更新日期：2001-12-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1562/0031-8655(2003)077<0129:plotnm>2.0.co;2
更新日期：2003-02-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
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pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：1991-08-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：
更新日期：1999-08-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
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更新日期：1993-12-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/j.1751-1097.2009.00628.x
更新日期：2010-01-01 00:00:00
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pub_type： 杂志文章
doi：10.1111/php.12805
更新日期：2017-11-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1562/0031-8655(2004)080<0531:EOLLIO>2.0.CO;2
更新日期：2004-11-01 00:00:00
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pub_type： 杂志文章
doi：10.1111/j.1751-1097.2010.00817.x
更新日期：2010-11-01 00:00:00
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pub_type： 杂志文章
doi：10.1562/2004-08-06-RA-264
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journal_title：Photochemistry and photobiology
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pub_type： 杂志文章
doi：10.1111/j.1751-1097.2008.00359.x
更新日期：2008-09-01 00:00:00
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pub_type： 杂志文章
doi：10.1111/php.12973
更新日期：2019-01-01 00:00:00
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更新日期：2017-01-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章,评审
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pub_type： 杂志文章
doi：10.1111/j.1751-1097.1995.tb08624.x
更新日期：1995-04-01 00:00:00
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更新日期：2014-01-01 00:00:00
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pub_type： 杂志文章
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更新日期：2005-11-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/php.12157
更新日期：2014-01-01 00:00:00
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journal_title：Photochemistry and photobiology
pub_type： 杂志文章
doi：10.1111/php.13301
更新日期：2020-11-01 00:00:00
