نتایج جستجو برای: electron lifetime
تعداد نتایج: 359790 فیلتر نتایج به سال:
Current experiments allow the possibility of gluino masses below about 600 MeV if the lifetime of the gluino is longer than 100 picoseconds. If the mass and lifetime are in this window, then photoproduction of pairs of gluino-gluon bound states can provide a means to observe them. The cross section is large enough that the window can be fully explored, up to lifetimes exceeding a microsecond, a...
Negative electron affinity photocathodes may have useful applications as electron sources for high-throughput microlithography @A. Baum et al., J. Vac. Sci. Technol. B 15, 2707 ~1997!#. However, the nature of such a system has raised questions about the lifetime and reliability of a cathode during operation. In this article, we report on the lifetime and reliability of cathode operation under v...
We demonstrate continuous voltage control of the nonradiative transition lifetime in semiconductor heterostructures. The results were obtained by picosecond time-resolved experiments on biased SiGe valence band quantum well structures using a free electron laser. By varying the applied voltage, the intersubband hole relaxation times for quantum well structures were varied by a factor of 2 as th...
We measure the T lepton lifetime with r+rpairs in which one or both of the T’S decays to three charged particles. The data were. collected with the CLEO II detector operating at the electron-positron collider CESR at energies on and near the Y(4.T). We use displacements of the three-track vertices to determine the 7 lifetime. The result is r7 = 289.0f 2.8 f 4.0 fs. PACS: 13.1O.+q; 13.35.+s
This paper describes measurements of the dynamics of hot electron cooling in photoexcited gold nanoparticles (Au NPs) with diameters of ∼3.5 nm, and passivated with either a hexadecylamine or hexadecanethiolate adlayer, using ultrafast transient absorption spectroscopy. Fits of these dynamics with temperature-dependent Mie theory reveal that both the electronic heat capacity and the electron-ph...
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