Energy transfer channels

Information about the rate constant of hopping ( hopp) through excitation energy transfer can be derived from the fast anisotropy decay time (02)- In order to take into account the possibility of multiple energy transfer channels in the case of a multichromophoric system containing identical chromophores, among which efficient dipole-dipole interactions occur, the measured anisotropy decay time 02 can be related to fchopp by Eq. (5), where the value of i represents the number... 

Summary of the Availability of Energy Transfer Channels for the Relaxation of Excited Heme in Myoglobin... 

The overtone of the y, mode is found to be the most important VER pathway from the excited v-, mode, y, is an iron out-of-plane mode associated with a porphine methine wagging motion, excited by the iron displacement out of the porphine plane following diatomic ligand photolysis in Mb. The coupling between the mode and coupled lower frequency bath modes are relatively weak and associated with small Fermi resonance parameters. The y, + y, to v, energy transfer channel was found to be the single most important pathway for energy transfer from the excited mode. 

From this equation it is possible to determine whether one or more energy transfer channels are operative. This is because the energy transfer probability is proportional to some power of concentration and a... 

Since both Pic and P2< are concentration dependent, it would seem that only one of them can be operative because of the Hnearity of r]olr] with (Coa + Cth) 2. We see from experiment that on excitation to the P multiplet energy transfer takes place. On excitation to the I multiplet the P level fluoresces. Hence, if there were an energy transfer channel via the I multiplet, this would mean that two channels are operative this is inconsistent with our previous results. Plence, we concluded that in the main it is the P channel which is operative for energy transfer. 

Energy transfer channels, in which electronicaUy exdted neutral products are... 

Setser et al °- have reviewed energy transfer channels observed in quenching by other polyatomic molecules. At present, quantitative branching measurements on these channels and the energy dependence of spectral distributions are underway and should greatly aid our understanding of these complex quenching reactions. 

In order to understand the dynamics of gas-surface interaction, it is necessary to determine how much energy is exchanged between the gas and surface atoms through the various energy-transfer channels. In addition the kinetic parameters (rate constants, activation energies, and preexponential factors) for each elementary surface step of adsorption, diffusion, and desorption are required in order to obtain a complete description of the gas-surface energy transfer process. 

Different pathways of vibrational relaxation of diatoms in thermal collisions with atoms are discussed in the framework of the Ehrenfest adiabatic principle and generalized Landau-Teller model. Since the efficiency of different energy-transfer channels depend very strongly on the value of the Ehrenfest exponent, it is possible to assign, for given collision partners and the heat-bath temperature, the vibrational energy transfer events to VT, VRT or VR processes. 

Construction of BODIPY-based probes with different mechanisms (a) PET (photoinduced electron transfer), (b) ICT (intramolecular charge transfer) and (c) FRET (Forster resonance energy transfer) channels. 

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