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81.
Maria Grazia Lupo Margherita Zavelani-Rossi Angela Fiore Dario Polli Luigi Carbone Roberto Cingolani Liberato Manna Guglielmo Lanzani 《Superlattices and Microstructures》2010
We studied the delocalization of electron wave function in asymmetric CdSe/CdS nanocrystals, consisting of a spherical CdSe dot embedded in an elongated CdS shell, by means of a pump–probe technique. By comparing the transient spectra obtained upon pumping the band edge transition of the CdSe in CdSe/CdS heterostructure and in a bare CdSe dot, we observed the delocalization of electron wave function at the CdSe/CdS interface. 相似文献
82.
F. Pisanello L. Martiradonna P. Spinicelli A. Fiore J.P. Hermier L. Manna R. Cingolani E. Giacobino M. De Vittorio A. Bramati 《Superlattices and Microstructures》2010
We report the evidence of a polarized single photon flux from a colloidal nanoparticle. We analyze, by time and polarization resolved spectroscopy measurements, the polarization behavior of a single CdSe/CdS core/shell dot in rod, achieving a polarization ratio at room temperature of ∼75% and a lifetime of the excited state of ∼11 ns. 相似文献
83.
Dr. Madhu Sudan Manna Rahul Sarkar Prof. Dr. Santanu Mukherjee 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(42):14912-14919
An enantioselective formal C(sp2)?H vinylation of prochiral 2,2‐disubstituted cyclopentene‐1,3‐dione is presented. This vinylative desymmetrization is realized by using a two‐step procedure that consists of a catalytic enantioselective vinylogous Michael addition of deconjugated butenolides to cyclopentene‐1,3‐dione and a base‐mediated decarboxylation. The overall process utilizes deconjugated butenolides as the source of the highly substituted vinyl unit. Five‐membered carbocycles containing a remote all‐carbon quaternary stereogenic center are obtained in good yields and with good to high enantioselectivities. 相似文献
84.
Ab initio calculations were performed on the tautomers and conformers of N-hydroxyurea using a 6-31G ** basis set. The minimum-energy structures have been found and the importance of the intramolecular hydrogen bond as the stabilizing factor was pointed out. © 1996 John Wiley & Sons, Inc. 相似文献
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A single sandpile model with quenched random toppling matrices captures the crucial features of different models of self-organized criticality. With symmetric matrices avalanche statistics falls in the multiscaling Bak-Tang-Wiesenfeld universality class. In the asymmetric case the simple scaling of the Manna model is observed. The presence or absence of a precise toppling balance between the amount of sand released by a toppling site and the total quantity the same site receives when all its neighbors topple once determines the appropriate universality class. 相似文献
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