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41.
L. W. Winkler J. N. Friend H. Noll W. D. Hatfield F. Wandenbulcke J. Zink F. Hollandt H. Lührig I. Bang J. Mayrhofer F. Haber und J. Jaenicke 《Fresenius' Journal of Analytical Chemistry》1927,70(3-4):155-159
Ohne Zusammenfassung 相似文献
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Jakubczyk D Shen Y Lal M Friend C Kim KS Wia Tkiewicz J Prasad PN 《Optics letters》1999,24(16):1151-1153
We report a study of two nonlinear optical processes at the nanoscale level, using a near-field probe: (i) two-photon-pumped upconversion from ZnS:Mn nanoparticles encapsulated with 2-[{(?) -2-[4 -(ethylsulfonyl) phenyl]- 1-ethenyl} (methyl)anilino]- 1-ethanethiol and (ii) second-harmonic generation (SHG) from N -(4-nitrophenyl)- (L) -prolinol crystallites. The use of highly efficient nonlinear organic chromophores together with special processing on the nanometer scale made it possible to observe and characterize what are believed to be the smallest topographically distinguishable objects reported so far, using nonlinear optical techniques. Issues pertaining to the study of two-photon-excited emission and SHG by use of a near-field probe are discussed. 相似文献
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For the first time, we demonstrate olefin epoxidation promoted by an extended Au surface. The oxidation of styrene to styrene epoxide, benzoic acid, and benzeneacetic acid is promoted on Au(111) covered with 0.2 ML of oxygen atoms. The estimated selectivity for styrene epoxide formation is approximately 53%. Total combustion to CO2 accounts for approximately 20% of the styrene reaction. We propose that styrene epoxide, benzoic acid, and benzeneacetic acid are produced via two possible oxametallacycle intermediates. Our work demonstrates that extended Au is an effective material for olefin oxidation, which has implications for understanding the activity of nanoscale Au catalysts. 相似文献
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Beljonne D Hennebicq E Daniel C Herz LM Silva C Scholes GD Hoeben FJ Jonkheijm P Schenning AP Meskers SC Phillips RT Friend RH Meijer EW 《The journal of physical chemistry. B》2005,109(21):10594-10604
Atomistic models based on quantum-chemical calculations are combined with time-resolved spectroscopic investigations to explore the migration of electronic excitations along oligophenylenevinylene-based chiral stacks. It is found that the usual Pauli master equation (PME) approach relying on uncoherent transport between individual chromophores underestimates the excitation diffusion dynamics, monitored here by the time decay of the transient polarization anisotropy. A better agreement to experiment is achieved when accounting for excitation delocalization among acceptor molecules, as implemented in a modified version of the PME model. The same models are applied to study light harvesting and trapping in guest-host systems built from oligomers of different lengths. 相似文献
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We have followed the pressure dependence of the onset and lock-in CDW transitions in VSe2 by measurements of resistivity and Hall effect up to 30 kbar. (The onset transition appears as a break in the slope of the resistivity, and the lock-in as ≈ 1% temperature hysteresis). Both transition temperatures rise at 0.8 K kbar?. We attribute this behaviour to pressure broadening of the d conduction band in the presence of strong electron Coulomb repulsion. 相似文献