Chemistry of Tantalum and Niobium Fluoride by Anatoly Agulyansky

By Anatoly Agulyansky

Digital, optical, mechanical and scientific home equipment are only a couple of examples of contemporary functions that use tantalum and niobium. In Chemistry of Tantalum and Niobium Fluoride Compounds, the writer attracts on thirty years' event to provide the 1st ever monograph to systemize and summarize the knowledge on hand on tantalum and niobium fluoride compounds. This finished reference resource bargains a wealthy number of learn technique and is necessary to researchers interpreting the chemistry of fluorides, in addition to lecturers and scholars in chemistry and metallurgy.

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GUZELIAN, U. BANIN, J. C. LEE and A. P. ALIVISATOS another semiconductor material on the surface of the particle. This has been accomplished in the case of HgS on CdS, 13-15 ZnS on CdSe, 1~and CdS on CdSe. 12 In the latter two cases dramatic increases in luminescence yields were observed as evidence of the reduction of surface traps. Also, the growth of an outer layer gives an entirely new variable to control as the relative band gaps of the two materials may be tuned to achieve desired properties.

Also, the examination of these properties may now be extended to another class of semiconductors which will add to the fundamental understanding of quantum confined systems. ACKNOWLEDGMENTS We would like to thank Andreas Kadavanich for the TEM photographs, Janet: Katari for contributions to the XPS studies and Professor Jim Heath of UCLA for contributions to many of the InP studies. B. thanks the Rothschild and Fulbright Foundations for fellowships. REFERENCES 1. Alivisatos,A. E Science 1996, 271,933.

Such a plot is presented in Figure 12 for four different sizes of InP nanocrystals. In panel (a), the inhomogeneous absorption spectrum for each size is plotted with the arrow indicating the wavelength of the pump pulse. Panel (b) shows the resulting holeburning spectrum for each size. The holeburning spectra are characterized by a narrow transition centered at the pump energy with a size-dependent width. In addition, there is a broader feature to higher energy. To determine the homogeneous linewidth, the hole spectra must be examined as a function of excitation wavelength.

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