title: Dispersed fluorescence and delayed ionization of jet-cooled 2-aminopurine: relaxation to a dark state causes weak fluorescence.
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).
authors.affiliation: Institut für Physikalische Chemie und Elektrochemie 1, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany.
authors.forename: Ke
authors.initials: K
authors.lastname: Feng
authors.forename: Gernot
authors.initials: G
authors.lastname: Engler
authors.forename: Kai
authors.initials: K
authors.lastname: Seefeld
authors.forename: Karl
authors.initials: K
authors.lastname: Kleinermanns
mesh_terms: D015075:2-Aminopurine / Q000737:chemistry*; D004583:Electrons; D005456:Fluorescent Dyes / Q000737:chemistry*; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence; D013696:Temperature
chemical_list: D005456:Fluorescent Dyes; D015075:2-Aminopurine