Relaxation processes in the excited state of phenylsiloxanes

1993 ◽  
Vol 89 (16) ◽  
pp. 3007 ◽  
Author(s):  
Kohhei Hamanishi ◽  
Haruo Shizuka
Keyword(s):  
Excited State ◽  
Relaxation Processes

Competition between electron transfer, trapping, and recombination in CdS nanorod–hydrogenase complexes

2015 ◽  
Vol 17 (8) ◽  
pp. 5538-5542 ◽  
Author(s):  
James K. Utterback ◽  
Molly B. Wilker ◽  
Katherine A. Brown ◽  
Paul W. King ◽  
Joel D. Eaves ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Kinetic Modeling ◽  
Rate Constants ◽  
Transient Absorption ◽  
Relaxation Processes ◽  
Absorption Measurements

Kinetic modeling of transient absorption measurements provides rate constants for the excited state relaxation processes relevant for photochemical H2 generation.

Excited-state relaxation processes in polymethine dye molecules in polymeric media

1996 ◽  
Vol 69 (2) ◽  
pp. 105-113 ◽  
Author(s):  
O. Przhonska ◽  
Yu. Slominsky ◽  
U. Stahl ◽  
S. Daehne
Keyword(s):  
Excited State ◽  
Relaxation Processes ◽  
Dye Molecules ◽  
Polymethine Dye ◽  
Polymeric Media

scholarly journals Computer Simulations of Viscosity Dependent Molecular Relaxation Processes

1985 ◽  
Vol 5 (3) ◽  
pp. 119-132 ◽  
Author(s):  
M. Kaschke ◽  
J. Kleinschmidt ◽  
B. Wilhelmi
Keyword(s):  
Excited State ◽  
Organic Dye ◽  
Relaxation Processes ◽  
Dye Molecules ◽  
Excited State Lifetime ◽  
Molecular Relaxation ◽  
Relaxation Transitions ◽  
Theoretical Investigations ◽  
Excited State Population ◽  
Viscosity Dependence

The dependence of excited-state lifetime, fluorescence quantum yield and isomerization rate of organic dye molecules on solvent viscosity has been a subject of numerous experimental and theoretical investigations. To explain the viscosity dependence of excited-state lifetime in this paper the temporal behavior of the excited state population is calculated for several models of the molecular relaxation process by a computer simulation incorporating both the stochastical motion of large molecular parts in the excited state and relaxation transitions. The described method is applicable to calculating the probability of changing the electronic state as a function of time and internal rotation coordinate.

scholarly journals Imaging ultrafast excited state pathways in transition metal complexes by X-ray transient absorption and scattering using X-ray free electron laser source

2016 ◽  
Vol 194 ◽  
pp. 639-658 ◽  
Author(s):  
Lin X. Chen ◽  
Megan L. Shelby ◽  
Patrick J. Lestrange ◽  
Nicholas E. Jackson ◽  
Kristoffer Haldrup ◽  
...  
Keyword(s):  
Excited State ◽  
Transition Metal ◽  
Free Electron ◽  
Free Electron Laser ◽  
Electronic Configuration ◽  
Laser Source ◽  
Relaxation Processes ◽  
Valence Orbital ◽  
X Ray ◽  
Orbital Energies

This report will describe our recent studies of transition metal complex structural dynamics on the fs and ps time scales using an X-ray free electron laser source, Linac Coherent Light Source (LCLS). Ultrafast XANES spectra at the Ni K-edge of nickel(ii) tetramesitylporphyrin (NiTMP) were measured for optically excited states at a timescale from 100 fs to 50 ps, providing insight into its sub-ps electronic and structural relaxation processes. Importantly, a transient reduced state Ni(i) (π, 3dx2−y2) electronic state is captured through the interpretation of a short-lived excited state absorption on the low-energy shoulder of the edge, which is aided by the computation of X-ray transitions for postulated excited electronic states. The observed and computed inner shell to valence orbital transition energies demonstrate and quantify the influence of the electronic configuration on specific metal orbital energies. A strong influence of the valence orbital occupation on the inner shell orbital energies indicates that one should not use the transition energy from 1s to other orbitals to draw conclusions about the d-orbital energies. For photocatalysis, a transient electronic configuration could influence d-orbital energies up to a few eV and any attempt to steer the reaction pathway should account for this to ensure that external energies can be used optimally in driving desirable processes. NiTMP structural evolution and the influence of the porphyrin macrocycle conformation on relaxation kinetics can be likewise inferred from this study.

Excited-state relaxation processes of three newly synthesized multi-branched alkyl-triphenylamine end-capped triazines

2019 ◽  
Vol 736 ◽  
pp. 136800
Author(s):  
Xiang Li ◽  
Zhiquan Wang ◽  
Yuting Gao ◽  
Zhengjun Shang ◽  
Minghao Ni ◽  
...  
Keyword(s):  
Excited State ◽  
Relaxation Processes

Investigation of excited-state relaxation processes of organic dyes by time-resolved spectroscopy

1996 ◽  
Author(s):  
O. Przhonska ◽  
Yu. Slominsky ◽  
A. Kachkovsky ◽  
U. Stahl ◽  
M. Senoner ◽  
...  
Keyword(s):  
Excited State ◽  
Organic Dyes ◽  
Relaxation Processes ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

Ultrafast vibrational relaxation processes induced by intramolecular excited state hydrogen transfer

2003 ◽  
Vol 374 (1-2) ◽  
pp. 13-19 ◽  
Author(s):  
Matteo Rini ◽  
Jens Dreyer ◽  
Erik T.J. Nibbering ◽  
Thomas Elsaesser
Keyword(s):  
Excited State ◽  
Vibrational Relaxation ◽  
Hydrogen Transfer ◽  
Relaxation Processes
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