Topic
Excimer
About: Excimer is a research topic. Over the lifetime, 3725 publications have been published within this topic receiving 75104 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: Values of pE derived in this way are found to be consistent with pE values derived from the milling crowd analysis of fluorescence yield titration experiments, suggesting that the rotation of the the pyrene moiety is the rate-limiting step for both the lateral mobility of py10 PC and intramolecular excimer formation in dipy10 PC.
47 citations
TL;DR: A quinoline based tripodal receptor that shows intermolecular excimer emission has been designed and synthesized as mentioned in this paper, which combines three different types of N-donor with the elegant fluorescent signaling properties.
47 citations
TL;DR: In this paper, the authors investigated the optically induced fission of singlet states in α- and β-perylene crystals at room temperature, and showed that the excimer is formed prior to fission emerging from the initially excited monomer state and that the rate of excimer formation k exc > 10 12 s −1.
47 citations
TL;DR: In this article, the photophysics of pyrene emission in supercritical fluids using steady-state and time-resolved fluorescence spectroscopy was investigated, showing that enhanced solute-solvent interactions (clustering) strongly affect the pyrene excimer reaction in CF{sub 3}H.
Abstract: In this paper, we continue our investigations of the photophysics of pyrene emission in supercritical fluids using steady-state and time-resolved fluorescence spectroscopy. Specifically, we study pyrene photophysics in sub- and supercritical C{sub 2}H{sub 4} and CF{sub 3}H. Steady-state fluorescence is utilized to determine how the local fluid density affects the ground and excited states of pyrene and to probe any potential ground-state dimerization (preassociation). Time-resolved fluorescence provides details of the mechanism of pyrene excimer formulation and the kinetics of solute-solute interactions. The temperature and density dependence of the recovered bimolecular rate constant for pyrene in supercritical C{sub 2}H{sub 4} follows that which had been reported in supercritical CO{sub 2} and liquid solvents, i.e., the excimer formation is diffusion controlled. In supercritical CF{sub 3}H this rate constant is much slower than predicted based on diffusion control arguments. These results indicate that enhanced solute-solvent interactions (clustering) strongly affect the pyrene excimer reaction in CF{sub 3}H. 53 refs., 10 figs., 4 tabs.
47 citations
TL;DR: In this paper, the lifetimes of two-color resonanceenhanced two-photon ionization (2C-RE2PI) via the S2 state were analyzed in a time-of-flight mass spectrometer.
Abstract: Van der Waals clusters of benzene are formed in a supersonic jet, subjected to two‐color resonance‐enhanced two‐photon ionization (2C‐RE2PI) via the S2 state, and analyzed in a time‐of‐flight mass spectrometer. The lifetimes of the excited states of benzene dimer and trimer are obtained by the 2C‐RE2PI technique. The observed lifetime data of the dimer and trimer show a biexponential decay, which corresponds to the lifetimes of the lowest singlet 1B1g state of a parallel spaced benzene excimer and an excited S1‐van der Waals dimer state. The two excited states are likely to be separated by a shallow potential barrier. The observed lifetimes of the parallel stacked lowest singlet excimer and the vibrationally excited S1‐van der Waals states of the benzene dimer are 122 and 24 ns, respectively. These excited states are produced as a result of the internal conversion from an optically excited S2‐van der Waals dimer state. The appearance potentials of the benzene dimer and trimer are also measured. The photoi...
47 citations