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Dispersed Fluorescence and Delayed Ionization of Jet‐Cooled 2‐Aminopurine: Relaxation to a Dark State Causes Weak Fluorescence
Author(s) -
Feng Ke,
Engler Gernot,
Seefeld Kai,
Kleinermanns Karl
Publication year - 2009
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200800816
Subject(s) - quantum yield , fluorescence , microsecond , chemistry , photochemistry , dark state , relaxation (psychology) , ionization , singlet state , analytical chemistry (journal) , excited state , atomic physics , physics , optics , ion , psychology , social psychology , organic chemistry , chromatography
Abstract Dark state: The photophysics of 9H‐2AP (see figure) depends strongly on the solvent and the temperature. In polar, aprotic solvents the fluorescence quantum yield is lower compared to protic ones. Analysis of the diffuse fluorescence spectra point to the existence of a dark singlet n,pi* state which is long‐lived (1 microsecond).