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 article, broad-band nonresonant stimulated Raman scattering (SRS) in the media H 2, D 2, CH 4, and LN 2 was used to create new families of UV lines.
Abstract: The UV excimer lasers ArF, KrCl, KrF, and XeCl were utilized to create new families of UV lines by multiple orders of broad-band nonresonant stimulated Raman scattering (SRS) in the media H 2 , D 2 , CH 4 , and LN 2 . Mixed-media and excited-state SRS were also studied.
98 citations
TL;DR: It was found that changing the concentration ratio of the pyrene to SDS molecules could be employed to control the aspect ratio and the characteristic fluorescence of the isolated pyrene molecules was suppressed and concurrently replaced by the excimer emission of the Pyrene nanostructures.
Abstract: Morphology-controllable synthesis of various pyrene nanostructures from nanoparticles to short nanorods and nanowires (long nanorods) was achieved by a simple self-assembly method. In this approach, aqueous sodium dodecyl sulfate (SDS) micelles were used as templates to direct the self-assembly of the pyrene molecules into nanorods. It was found that changing the concentration ratio of the pyrene to SDS molecules could be employed to control the aspect ratio (length to diameter) of the pyrene nanostructures from 1 to 50 or higher. Moreover, the dimensional variation was accompanied by changes of their optical properties. With the increase of the aspect ratio, the characteristic fluorescence of the isolated pyrene molecules was suppressed and concurrently replaced by the excimer emission of the pyrene nanostructures. A blue-shift was observed in the excimer emission peaks as the length of the nanorods increased. The growth mechanism and the change in optical properties of these pyrene nanostructures were d...
97 citations
TL;DR: In this article, both unpolarized and linearly polarized radiation at 248 and 308 nm produce well ordered, micron-scale structures over dimensions greatly exceeding the coherence area of the laser at the surface.
Abstract: Periodic surface structures have been observed on organic polymers when photoablated using low coherence excimer lasers. Both unpolarized and linearly polarized radiation at 248 and 308 nm produce well ordered, micron‐scale structures over dimensions greatly exceeding the coherence area of the laser at the surface. Surface scattered wave effects appear to explain these structures.
96 citations
TL;DR: Comparison with Frenkel exciton dynamics in PBI dimeric and oligomeric H-aggregates demonstrates that in the quadruple stack coherent exciton propagation is absent due to its short length of aggregates, thereby it has only one relaxation pathway to the excimer state.
Abstract: An adequately designed, bay-tethered perylene bisimide (PBI) dimer Bis-PBI was synthesized by Pd/Cu-catalyzed Glaser-type oxidative homocoupling of the respective PBI building block. This newly synthesized PBI dimer self-assembles exclusively and with high binding constants of up to 106 M-1 into a discrete π-stack of four chromophores. Steady-state absorption and emission spectra show the signatures of H-type excitonic coupling among the dye units. Broadband fluorescence upconversion spectroscopy (FLUPS) reveals an ultrafast dynamics in the optically excited state. An initially coherent Frenkel exciton state that is delocalized over the whole quadruple stack rapidly (τ = ∼200 fs) loses its coherence and relaxes into an excimer state. Comparison with Frenkel exciton dynamics in PBI dimeric and oligomeric H-aggregates demonstrates that in the quadruple stack coherent exciton propagation is absent due to its short length of aggregates, thereby it has only one relaxation pathway to the excimer state. Furthermore, the absence of pump-power dependence in transient absorption experiments suggests that multiexciton cannot be generated in the quadruple stack, which is in line with time-resolved fluorescence measurements.
96 citations
TL;DR: Rabbit skeletal and cardiac tropomyosin were specifically labeled at their cysteine side chains with N-(1-pyrene)-maleimide, indicating an inhibition of the salt-dependent polymerizability.
95 citations