News Column

Studies Conducted at Northwestern University on Quantum Dots Recently Reported

June 4, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- Current study results on Quantum Dots have been published. According to news reporting out of Evanston, Illinois, by VerticalNews editors, research stated, "This paper describes analytical and numerical results from a model Hamiltonian method applied to electron transfer (ET) from a quasicontinuum (QC) of states to a set of discrete states, with and without a mediating bridge. Analysis of the factors that determine ET dynamics yields guidelines for achieving high-yield electron transfer in these systems, desired for instance for applications in heterogeneous catalysis."

Our news journalists obtained a quote from the research from Northwestern University, "These include the choice of parameters of the laser pulse that excites the initial state into a continuum electronic wavepacket and the design of the coupling between the bridge molecule and the donor and acceptor. The vibrational mode on a bridging molecule between donor and acceptor has an influence on the yield of electron transfer via Franck-Condon factors, even in cases where excited vibrational states are only transiently populated."

According to the news editors, the research concluded: "Laser-induced coherence of the initial state as well as energetic overlap is crucial in determining the ET yield from a QC to a discrete state, whereas the ET time is influenced by competing factors from the coupling strength and the coherence properties of the electronic wavepacket."

For more information on this research see: Theory of ultrafast photoinduced electron transfer from a bulk semiconductor to a quantum dot. Journal of Chemical Physics, 2014;140(14):28-40. Journal of Chemical Physics can be contacted at: Amer Inst Physics, Circulation & Fulfillment Div, 2 Huntington Quadrangle, Ste 1 N O 1, Melville, NY 11747-4501, USA. (American Institute of Physics - www.aip.org/; Journal of Chemical Physics - jcp.aip.org/)

Our news journalists report that additional information may be obtained by contacting A.M. Rasmussen, Northwestern University, Dept. of Chem, Evanston, IL 60208, United States. Additional authors for this research include S. Ramakrishna, E.A. Weiss and T. Seideman.

Keywords for this news article include: Evanston, Illinois, Electronics, Quantum Dots, United States, Semiconductor, Nanotechnology, Emerging Technologies, North and Central America

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Electronics Newsweekly


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