Topic
Excimer
About: Excimer is a research topic. Over the lifetime, 3725 publications have been published within this topic receiving 75104 citations.
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TL;DR: In this paper, the 1,1'-dipyrenyl)-methyl ether [Dipyme showed intramolecular excimer fluorescence in competition with fluorescence from locally excited pyrene chromophore.
Abstract: — The molecule (1,1'-dipyrenyl)-methyl ether [dipyme] shows intramolecular excimer fluorescence in competition with fluorescence from the locally excited pyrene chromophore. This intensity ratio Ic/Im is sensitive to solvent viscosity. The molecule is soluble in synthetic phospholipid membranes. 1H NMR studies suggest that the molecule is localized in the hydrocarbon region of the membrane. Fluorescence measurements at various temperatures of dipyme dissolved in these membranes show that Ic/Im is exceedingly sensitive to fluidity changes accompanying both the pretransitions and the gel to liquid crystalline transitions of the membrane. These studies can be carried out at a mole ratio of probe to lipid 102-103 smaller than that necessary to observe bimolecular pyrene excimer formation.
43 citations
TL;DR: In this article, the molecular conformations of naphthalenophanes are divided into three groups by means of MM2 calculations: (a) parallel forms (1 and 2), (b) antiparallel form (3), and (c) tilted forms (4 and 5).
Abstract: The photophysical processes of naphthalenophanes having different molecular structures have been studied by measurements of emission spectra, emission quantum yields, intersystem crossing (ISC) quantum yields, and lifetimes. The molecular conformations of naphthalenophanes are divided into three groups by means of MM2 calculations: (a) parallel forms (1 and 2), (b) antiparallel form (3), and (c) tilted forms (4 and 5). The singlet excimer state 1 EX * formed via the Franck-Condon excited singlet state 1 (R * -R) or 1 (R * ΛR) is produced very rapidly. Intramolecular excimer emissions are observed significantly for naphthalenophanes except for the antiparallel form 3
43 citations
TL;DR: The rise curves of fluorescence from the excimer excitons in pyrene and perylene crystals were observed with the use of the equipment for fluorescence lifetime measurements in the picosecond region.
Abstract: The rise curves of fluorescence from the excimer excitons in pyrene and perylene crystals were observed with the use of the equipment for fluorescence lifetime measurements in the picosecond region. The time constants of excimer formation in pyrene and perylene crystals at 293 and 77 K were found to be considerably shorter than 20 ps. From this result and the previously reported hopping time of excitons in pyrene crystal (20 ps) at room temperature, it is concluded that the sum of the time constants for conformational change of an energy‐donating pair and excimer‐energy transfer is about 20 ps.
43 citations
43 citations
TL;DR: In this article, potential curves, transition wavelengths, radiative lifetimes, and cross sections for stimulated emission for several alkali halide ions are calculated for both VUV and XUV regions.
Abstract: Optical transitions in ionic excimer molecules seem to be suitable candidates for lasers in the VUV and XUV region. Potential curves, transition wavelengths, radiative lifetimes, and cross sections for stimulated emission are calculated for several alkali halide ions. In addition, possible laser transitions in rare gas halide ions are briefly discussed.
43 citations