نتایج جستجو برای: ray charge dmicy
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Two novel n-type disk-shaped molecules containing a triphenylene core and three fused naphthaleneimide imidazole or peryleneimide imidazole "arms" are synthesized and characterized. The n-type charge carrier mobilities of these molecules are evaluated by both field effect transistors and space-charge limited-current measurements, which exhibit drastically different mobility anisotropy. A strong...
We have used polarized Cu K-edge extended x-ray absorption fine structure to investigate the local lattice displacements in the charge-ordered La1.48Nd0.4Sr0.12CuO4 system. The temperature-dependent distance broadening, given by the Debye-Waller factors of the Cu-O bonds measuring local lattice fluctuations, shows a clear steplike increase below the charge stripe order temperature. The results ...
Interface properties of cobalt(II) phthalocyanine (CoPc) and cobalt(II) hexadecafluoro-phthalocyanine (CoPcF16) to gold are investigated by photo-excited electron spectroscopies (X-ray photoemission spectroscopy (XPS), ultraviolet photoemission spectroscopy (UPS) and X-ray excited Auger electron spectroscopy (XAES)). It is shown that a bidirectional charge transfer determines the interface ener...
Charge-ordered manganites of composition Pr 1−x (Ca 1−y Sr y) x MnO 3 exhibit persistent pho-toconductivity upon exposure to x-rays. A detailed comparison of the evolution of the conductivity with x-ray illumination and with magnetic field shows that polarization of local spins by x-ray generated hot electrons is predominantly responsible for this effect. As spin-polarized metallic clusters per...
Electrostatic interactions play an important role in the functioning of biological membranes. Membranes often bear a negative charge, mainly due to a presence of acidic phospholipids as well as membrane proteins and gangliosides. Therefore, it is important to study the phase behavior and structure of acidic phospholipids in dependence on pH, ionic strength and the nature of counterions (size, c...
The charge state and local ordering of Mn doped into a pulsed laser deposited single-phase thin film of ZnO are investigated by using x-ray absorption spectroscopy at the O K-edge, Mn K-edge and L-edge, and x-ray emission spectroscopy at the O K-edge and Mn L-edge. This film is ferromagnetic at room temperature. EXAFS measurement shows that Mn(2+) replaces the Zn site in tetrahedral symmetry, a...
An important type of radiation damage in CCDs used for X-ray spectroscopy is the degradation of charge transfer eeciency (CTE). Traps associated with radiation induced defects are the basic cause of the damage. Here, we describe a method to extract trap characteristics using small charge packets produced by individual X-ray photon interactions in rectangular imaging CCDs. The method applies the...
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