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1.
Photoinduced electron transfer (PET) was studied in toluene solutions of the Pd-porphyrin-quinone (Pd-PQ) dyad by flash photolysis
in the picosecond time range and by a luminescence method. It is found that Pd-PQ has a high rate of intercombination conversion
Kisc=(7.7±0.2)·1010 sec−1. Competing intramolecular PET occurs from the lower excited singlet state of the dyad with the rate constant K
et
s
=(2.7 ±0.3)·1010 sec−1. Therefore, ∼74% of excited molecules from the dyad make a transition to the triplet T1 state and 26% take part in intramolecular PET resulting in formation of radical products. The radical products relax to the
ground state with the rate constant K=(7.4±0.2)·109 sec−1.
Institute of Molecular and Atomic Physics of the National Academy of Sciences of Belarus, 70, F. Skorina St., Minsk, 220072,
Belarus. Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 1, pp. 11–18, January–February, 1999. 相似文献
2.
V. V. Sapunov 《Journal of Applied Spectroscopy》1996,63(4):514-521
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70. F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 63, No. 4, pp. 613–621, July–August, 1996. 相似文献
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Shuping Zhang 《Applied Surface Science》2008,254(20):6662-6665
The photoluminescence properties of the blend films consisting of the hole transport and electron transport materials, PVK and Alq3, are studied by steady-state and time-resolved photoluminescence (PL) spectroscopy. Both the relative intensity and the photoluminescence lifetime are intensively dependent of the weight ratios of PVK and Alq3. The detailed analysis of experiment data provides clear evidence for a Förster energy transfer from excited PVK, as donor, to Alq3, as acceptor, based on nonradiative resonant transfer mechanism, and allows the determination of Förster radius and the concentration dependent energy transfer efficiency. 相似文献
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N. A. Borisevich D. A. Kazberuk S. V. Mel'nichuk S. A. Tikhomirov G. B. Tolstorozhev 《Journal of Applied Spectroscopy》1995,62(3):441-446
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70 F. Skaryna Ave, Minsk 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 3, pp. 49–55, May–June, 1995. 相似文献
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J. Schlüpmann K. M. Salikhov M. Plato P. Jaegermann F. Lendzian K. Möbius 《Applied magnetic resonance》1991,2(1):117-142
From time-resolved direct detection cw EPR with pulsed laser excitation, the photoinduced electron transfer and spin dynamics (CIDEP) in mixed zinc-tetraphenylporphyrin (ZnTPP)/benzo-1,4-quinone (BQ) ethanol solutions were determined as functions of temperature and BQ concentration. At lower temperatures the EPR spectra reveal that mixing of the S and T?1 states in the charge separated radical pair gains in importance relative to the ST0 mixing. Furthermore, at lower temperatures, the EPR spectra of the spin-correlated radical pairs of ZnTPP+ and BQ7 could also be observed. From the temperature/viscosity dependence of the electron transfer rates and of the polarization contributions from the triplet and radical pair mechanisms, deviations from a macroscopic diffusion behaviour are inferred at lower temperatures. 相似文献
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Conditions for the emergence of spatially asymmetric retrieval states in an attractor neural network
In this paper we show that during the retrieval process in a binary symmetric Hebb neural network, spatially localized states
can be observed when the connectivity of the network is distance-dependent and a constraint on the activity of the network
is imposed, which forces different levels of activity in the retrieval and learning states. This asymmetry in the activity
during retrieval and learning is found to be a sufficient condition to observe spatially localized retrieval states. The result
is confirmed analytically and by simulation. 相似文献
20.
Quantum-chemical testing of donor-acceptor properties of binary molecular complexes, related to the singlet state, is suggested
as QCh calculations of studied systems and their constituents by using both spin-nondependent (RHF) and spindependent (UHF)
versions of the exploited computational tool. The avoided crossing of intermolecular interaction terms of neutral moleculesE
int
(A
0
B
0) and molecular ionsE
int
(A
+
B
−) causes a multi-mode character of the ground state term. The dependence of D-A complex properties on the type of the term,
space positions of the term minimum, and the interrelation of the corresponding energies are discussed. The suggested approach
has been applied to binary complexes C60+X (X=TAE, TDAE, DMMA, COANP, 2Li, Mg). 相似文献