Excitation transfer,

A-B relative or external motion undergo free-free transitions (E., E. + dE.) (Ej Ej+ dE within the translational continuum, while the structured particles undergo bound-bound (excitation, de-excitation, excitation transfer) or bound-free (ionization, dissociation) transitions = (a, 3) ->/= (a, (3 ) in their internal electronic, vibrational or rotational structure. The transition frequency (s ) for this collision is... 

Lee, J., Wang, Y., and Gibson, B. G. (1991a). Electronic excitation transfer in the complex of lumazine protein with bacterial bioluminescence intermediates. Biochemistry 30 6825-6835. 

Research on the molecular basis of photoexcitation and electron transfer, including interactions of electron donor and acceptor molecules, could lead to new photochemicals. Development of model photosensitive compounds and methods of incorporating them into membranes containing donor, acceptor, or intermediate excitation transfer molecules, and... 

Similar to molybdenum oxide catalyst the capability to emit singlet oxygen is inherent to Si02 doped by Cr ions as well. Similar to the case of vanadium oxide catalysts in this system the photogeneration occurs due to the triplet-triplet electron excitation transfer from a charge transfer complex to adsorbed oxygen. 

Th. Forster, Delocalized Excitation and Excitation Transfer, in Modem Quantum Chemistry, VoL 3, O. Sinnanoglu, ed., Academic Press (1965). 

Pullerits, T., S. Hess, J. L. Herek, and V. Sundstrom. 1997. Temperature dependence of excitation transfer in LH2 of Rhodobacter sphaeroides. J. Phys. Chem. B 101 10560-10567. 

Forster, T. (1965). Delocalized excitation and excitation transfer. In Modern Quantum Chemistry Part III Action of Light and Organic Molecules. (Sunanoglu, O., ed.). Vol. 3. Academic, New York, pp. 93-137. 

Damjanovic, A., Ritz, T. and Schulten, K. (2000). Excitation transfer in the peridinin-chlorophyll-protein of Amphidinium carterae. Biophys. J. 

Secondary ions formed in an excitation transfer process—namely, A + B— A + B+ + e—require that E(A)>I(B), where E(A) is the excitation... 

Not much is known about these processes, but they must be included to give a total picture. Emissions of Lyman and Balmer spectra of the H atom upon e-impact on hydrocarbons, H2, and H20, discussed in Sect. 4.3.2, fall in this category. Similarly, many of the excited states observed in dissociated radicals via electron impact on stable molecules (Polak and Slovetsky, 1976) also belong to this category. It is known from the dipole oscillator spectrum of H20 (Platzman, 1967) that most ionizations are accompanied by considerable excitation. Excitation transfer to the neighboring neutral molecule followed by fast dissociation cannot be ruled out. 

Wong KF, Bagchi B, Rossky PJ (2004) Distance and orientation dependence of excitation transfer rates in conjugated systems beyond the Forster theory. J Phys Chem A 108 5752-5763... 

Excitation transfer requires some interaction between unexcited and excited molecules M and M, respectively. We denote the two molecules under consideration as M and M. The interaction can then be expressed as occurring between the two configurations MM and M M ... 

Baldo et al. [ 164] used the platinum complex of 2,3,7,8,12,13,17,18-octaethyl-21 //,23//-porphine (PtOEP, 66) as efficient phosphorescent material. This complex absorbs at 530 nm and exhibits weak fluorescence at 580 nm but strong phosphorescence from the triplet state at 650 nm. Triplet transfer from a host like Alq3 was assumed to follow the Dexter mechanism. Dexter-type excitation transfer is a short-range process involving the exchange of electrons. In contrast to Forster transfer, triplet exciton transfer is allowed. 

K. Nithipatikom and L. B. McGown, Homogeneous immunochemical technique for determination of human lactoferrin using excitation transfer and phase-resolved fluorometry. Anal. Chem. 59,... 

E. F. Ullman, M. Schwarzberg, and K. E. Rubenstein, Fluorescent excitation transfer immunoassay. A general method for determination of antigens, J. Biol. Chem. 251, 4172 4178 (1976). 

E. F. Ullman and P. L. Khanna, Fluorescence excitation transfer immunoassay (FETI), Methods in Enzymology 74, 28-60 (1981). 

J. Eisinger, B. Feuer, and A. A. Lamola, Intramolecular singlet excitation transfer. Applications to polypeptides, Biochemistry 8, 3908-3915 (1969). 

One would still like to examine the effect of ethidium on the torsional rigidity and dynamics at high binding ratios. One would also like to test the Forster theory for excitation transfer between bound ethidium molecules, since it has been questioned/65- This is possible in principle by deconvoluting the effects of depolarization by excitation transfer on the FPA, as will be shown subsequently. DLS also provides crucial information on this same question. 

Our experiments are typically carried out at DNA concentrations of 20-50 /ig/ml with 1 ethidium per 300 bp, so that depolarization by excitation transfer is negligible.(18) The sample is excited with 575-nm light, and the fluorescence is detected at 630, 640, or 645 nm. Less than one fluorescent photon is detected for every 100 laser shots. The instrument response function e(t) is determined using 575-nm incident light scattered from a suspension of polystyrene latex spheres. 

To avoid depolarization by excitation transfer, the DNA is unwound using a second intercalator, for example, chloroquine, that does not engage in excitation transfer to or from the extremely dilute FPA probe, ethidium. Equation (4.68) applies to chloroquine when it is in excess, but the simultaneous binding of trace ethidium obeys a somewhat different relation, which is expressed in terms of the ratio of amplitudes (Ab/Af) of the bound (slow) and free (fast) components in its fluorescence decay as follows<53) ... 

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