Ž . The quenching of highly vibrationally excited O in collision with O Õs0 is investigated using a semiclassical wave 2 2 Ž . packet method. We find that nonreactive collisions dominate the relaxation of O Õ and for Õ in the range 25 to 30 the 2 reactive channel makes little contribution to the quenching process, in agreement with our earlier investigation. We report Ž . vibrational transition...

The quenching of excited singlet methylene blue (IMB + * ) by N,N-dimethylaminomethylferrocene (FcN) in acetonitrile at room temperature has been studied using femtosecond pump-probe absorption spectroscopy. At high FcN concentration static quenching via an intermolecular electron transfer mechanism constitutes the predominating decay channel for l MB + * The time constants of the large amplitu...

Consider the parabolic problem u t div (a(u;ru)ru) = u p (1) for t > 0, x 2 R n under initial and boundary conditions u = 1, say. Since p is assumed positive, the right hand side becomes singular as u ! 0. When u reaches zero in nite or in nite time, one says that the solution quenches in nite or in nite time. This article gives a survey of results on this kind of problem and emphasizes those t...

Abstract This paper is based on a keynote lecture presented by Prof. Fechte-Heinen during the 2 nd International Conference Quenching and Distortion Engineering in April 2021. Firstly, it presents short summary of basics distortion formation. The mechanisms potential for with its carriers are discussed more detail. Furthermore, method explained. Finally, selected examples that illustrate connec...

Two-dimensional (2D) materials have attracted tremendous interest as fluorescence quenchers of dye-labeled biomolecules for application in biosensing. Metal-organic framework (MOF) nanosheets, as a new type of 2D material, have rarely been studied as bioanalytical platforms. Herein, we synthesize a series of ultrathin lanthanide-based MOF (MOF-Ln) nanosheets as a dye-labeled aptamer platform. T...

The excited state and redox properties of three crown-ether derivatives of squaraines have been studied. Direct laser excitation of these dyes leads to the formation of excited triplets, dye radical cations and anions, via a biphotonic photoionization mechanism. All these transient species absorb strongly in the visible region. The triplet states of these dyes generated via triplet-triplet ener...