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: Femtosecond near-infrared transient absorption experiments reveal a unique low-energy transition that can be used to identify and characterize this state without overlapping excited singlet-state absorption.
Abstract: Energy transfer in perylene-3,4:9,10-bis(dicarboximide) (PDI) aggregates is often limited by formation of a low-energy excimer state. Formation dynamics of excimer states are often characterized by line shape changes and peak shift dynamics in femtosecond visible transient absorption spectra. Femtosecond near-infrared transient absorption experiments reveal a unique low-energy transition that can be used to identify and characterize this state without overlapping excited singlet-state absorption. Three covalently bound PDI dimers with differing PDI-PDI distances were studied to probe the influence of interchromophore electronic coupling on the PDI excimer transient spectra and dynamics.
150 citations
TL;DR: In this article, a novel fluorescent sensor was prepared and used as an ion-selective chemosensor for Al(III) via intramolecular excimer formation, from which a significant red shift along with an intensity enhancement of the excimer emission was observed in the presence of Al (III)
149 citations
TL;DR: An anthracene-based material, 2-(anthracen-9-yl)thianthrene (), whose crystal exhibits excimer fluorescence with an unexpected high luminous efficiency and long lifetime, will update the traditional view that excimers are poorly efficient in photoluminescence.
148 citations
TL;DR: The use of pyrene as a powerful probe for studying protein spatial organization is presented and it is inferred that oligomerization via the C-terminal domain juxtaposes the linker segments from neighboring apoE molecules.
Abstract: Pyrene is a spatially sensitive probe that displays an ensemble of monomeric fluorescence emission peaks (375–405 nm) and an additional band (called excimer) at ∼460 nm when two fluorophores are spatially proximal. We examined if there is a correlation between distance between two pyrenes on an α-helical structure and excimer/monomer (e/m) ratio. Using structure-guided design, pyrene maleimide was attached to pairs of Cys residues separated by ∼5 A increments on helix 2 of the N-terminal domain of apolipoprotein E3 (apoE3). Fluorescence spectral analysis revealed an intense excimer band when the probes were ∼5 A from each other with an e/m ratio of ∼3.0, which decreased to ∼1.0 at 20 A. An inverse correlation between e/m ratio and the distance between pyrenes was observed, with the probe and helix flexibility also contributing to the extent of excimer formation. We verified this approach by estimating the distance between T57C and C112 (located on helices 2 and 3, respectively) to be 5.2 A (4.9 A from NMR...
144 citations
TL;DR: In this paper, the microhollow cathode discharge was found to be an intense source of xenon and argon excimer radiation peaking at wavelengths of 170 and 130 nm, respectively.
Abstract: A novel, nonequilibrium, high-pressure, direct current discharge, the microhollow cathode discharge, has been found to be an intense source of xenon and argon excimer radiation peaking at wavelengths of 170 and 130 nm, respectively. In argon discharges with a 100 μm diam hollow cathode, the intensity of the excimer radiation increased by a factor of 5 over the pressure range from 100 to 800 mbar. In xenon discharges, the intensity at 170 nm increased by two orders of magnitude when the pressure was raised from 250 mbar to 1 bar. Sustaining voltages were 200 V for argon and 400 V for xenon discharges, at current levels on the order of mA. The resistive current–voltage characteristics of the microdischarges indicate the possibility to form arrays for direct current, flat panel excimer lamps.
143 citations