نتایج جستجو برای: electron lifetime
تعداد نتایج: 359790 فیلتر نتایج به سال:
Illumination of diamond with above-bandgap light results in emission of electrons into water and formation of solvated electrons. Here we characterize the materials factors that affect that dynamics of the solvated electrons produced by illumination of niobium substrates and of diamond thin films grown on niobium substrates using transient absorption spectroscopy, and we relate the solvated ele...
C60(2-) and C70(2-) dianions have been produced by electrospray of the monoanions and subsequent electron pickup in a Na vapor cell. The dianions were stored in an electrostatic ring and their decay by electron emission was measured up to 1 s after injection. While C70(2-) ions are stable on this time scale, except for a small fraction of the ions which have been excited by gas collisions, most...
We present a kinetic analysis of the nonadiabatic decay mechanism of an excited state hydrated electron to the ground state. The theoretical treatment is based on a quantized, gap dependent golden rule rate constant formula which describes the nonadiabatic transition rate between two quantum states. The rate formula is expressed in terms of quantum time correlation functions of the energy gap a...
The x-ray spectroscopy performance of In/Al doped CdZnTe planar detectors based on as-grown crystals were investigated at room temperature, using a Tb x-ray source with a principle energy of 44.2 keV. The observed broadening in the photopeak resolution was attributed to incomplete charge carrier collection due to carrier trapping and scattering by the defects in the crystal. Alpha particle spec...
We report and discuss high-flux generation of circularly polarized γ-rays by means of Compton scattering. The γ-ray beam results from the collision of an external-cavity-enhanced infrared laser beam and a low emittance relativistic electron beam. By operating a non-planar bow-tie high-finesse optical Fabry-Perot cavity coupled to a storage ring, we have recorded a flux of up to (3.5 ± 0.3) × 10...
A new class of synchrotron light sources, based on the use of superconducting electron linear accelerators and beam recirculation with energy recovery, is currently under active consideration. The injectors for such accelerators must deliver high brightness electron beams with appropriate RF time structure and the full average beam current. Various photoemission cathodes have been demonstrated ...
In this review we give an overview of the present status of research on carbon nanotube (CNT) field emitters and their applications. Several different construction principles of field-emission devices with CNTs are summarized. The emission mechanism is introduced and a detailed overview is given of the measured emission properties and related topics of CNT electron sources. We give also several...
Spin helices in GaAs quantum wells: Interplay of electron density, spin diffusion, and spin lifetime
To establish a correlation between the spin diffusion, lifetime, and electron density, we study, employing time-resolved magneto-optical Kerr effect microscopy, polarization evolution in low-dimensional GaAs semiconductors hosting two-dimensional gases. It is shown that for establishment of longest spin-lifetime, variation scattering rate with density higher importance than fulfilling persisten...
The dependence of the inelastic lifetime of electrons in the image-potential states of Cu(100) on their momentum parallel to the surface has been studied experimentally by means of time- and angle-resolved two-photon photoemission and theoretically by evaluating the electron self-energy within the GW approximation. The pronounced decrease of the n = 1 lifetime from 40 fs at normal emission (k(p...
Related Articles Influence of exciton lifetime on charge carrier dynamics in an organic heterostructure Appl. Phys. Lett. 102, 113304 (2013) Influence of exciton lifetime on charge carrier dynamics in an organic heterostructure APL: Org. Electron. Photonics 6, 52 (2013) Influence of internal absorption and interference on the optical efficiency of thin-film GaN-InGaN light-emitting diodes Appl....
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