排序方式: 共有55条查询结果,搜索用时 15 毫秒
21.
Strojnik M Omerzu A Majkić A Mihailovic PM Lukan J Bavdek G Bratina G Cvetko D Topolovsek P Mihailovic D 《Langmuir : the ACS journal of surfaces and colloids》2011,27(8):4296-4299
The work function W of Mo(6)S(3)I(6) molecular nanowires is determined by Kelvin probe (KP) measurements, UV photoelectron spectroscopy (UPS), and cyclic voltammetry (CV). The values obtained by all three methods agree well, giving W = 4.8 ± 0.1 eV. CV measurements also give a gap between the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) of E(g) = 1.2 ± 0.1 eV, in agreement with recent optical measurements, but in disagreement with theoretical calculations, which predict the material to be a metal. The electronic structure of Mo(6)S(3)I(6) suggests use of the material in applications such as bulk heterostructure photovoltaics and transparent electrodes and for molecular electronics devices. 相似文献
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Zürn G Serwane F Lompe T Wenz AN Ries MG Bohn JE Jochim S 《Physical review letters》2012,108(7):075303
We study a system of two distinguishable fermions in a 1D harmonic potential. This system has the exceptional property that there is an analytic solution for arbitrary values of the interparticle interaction. We tune the interaction strength and compare the measured properties of the system to the theoretical prediction. For diverging interaction strength, the energy and square modulus of the wave function for two distinguishable particles are the same as for a system of two noninteracting identical fermions. This is referred to as fermionization. We have observed this phenomenon by directly comparing two distinguishable fermions with diverging interaction strength with two identical fermions in the same potential. We observe good agreement between experiment and theory. By adding more particles our system can be used as a quantum simulator for more complex systems where no theoretical solution is available. 相似文献
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Ligita Valeikiene Inga Grigoraviciute-Puroniene Arturas Katelnikovas Aleksej Zarkov Aivaras Kareiva 《Molecules (Basel, Switzerland)》2021,26(7)
In the present work, Cr-substituted Mg3Al1−xCrx layered double hydroxides (LDHs) were synthesised through the phase conversion of sol-gel-derived mixed-metal oxides in an aqueous medium. The chromium substitution level in the range of 1 to 25 mol% was investigated. It was demonstrated that all synthesised specimens were single-phase LDHs. The results of elemental analysis confirmed that the suggested synthetic sol-gel chemistry approach is suitable for the preparation of LDHs with a highly controllable chemical composition. The surface microstructure of sol-gel-derived Mg3Al1−xCrx LDHs does not depend on the chromium substitution level. The formation of plate-like agglomerated particles, which consist of hexagonally shaped nanocrystallites varying in size from approximately 200 to 300 nm, was observed. Optical properties of the synthesised Mg3Al1−xCrx LDHs were investigated by means of photoluminescence. All Cr-containing powders exhibited characteristic emission in the red region of the visible spectrum. The strongest emission was observed for the sample doped with 5 mol% Cr3+ ions. However, the emission intensity of samples doped with 1–10 mol% Cr3+ ions was relatively similar. A further increase in the Cr3+ ion concentration to 25 mol% resulted in severe concentration quenching. 相似文献
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Leila Mohammadzadeh Aleksej Goduljan Dr. Fernanda Juarez Dr. Paola Quaino Dr. Elizabeth Santos Prof. Dr. Wolfgang Schmickler 《Chemphyschem》2016,17(1):78-85
We investigate the insertion of halide and alkali atoms into narrow single‐walled carbon nanotubes with diameters <9 Å by density functional theory; both chiral and non‐chiral tubes are considered. The atoms are stored in the form of ions; the concomitant charge transfer affects the band structure and makes originally semiconducting tubes conducting. The electrostatic interaction between a charge and the walls of the tube is explicitly calculated. The insertion energies and the positions of the ions are determined by a competition between electrostatic energy and Pauli repulsion. For comparison, we consider ions in gold nanotubes. Alkali ions follow the same principles in gold as in carbon tubes, but chloride is specifically adsorbed inside gold tubes. 相似文献
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Aleksej Turnšek 《Journal of Mathematical Analysis and Applications》2007,336(1):625-631
We answer a question posed by Chmieliński, whether a linear map which approximately preserves orthogonality must be close to an orthogonality preserving one. Furthermore, we give a short proof of the stability of the orthogonality equation on finite dimensional Hilbert spaces. 相似文献
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Dr. Shu‐Ping Luo Dr. Esteban Mejía Aleksej Friedrich Alexandra Pazidis Dr. Henrik Junge Dr. Annette‐Enrica Surkus Dr. Ralf Jackstell Stefania Denurra Prof. Dr. Serafino Gladiali Prof. Dr. Stefan Lochbrunner Prof. Dr. Matthias Beller 《Angewandte Chemie (International ed. in English)》2013,52(1):419-423
29.
Golks F Krug K Gründer Y Zegenhagen J Stettner J Magnussen OM 《Journal of the American Chemical Society》2011,133(11):3772-3775
We present in situ X-ray surface diffraction studies of interface processes with data acquisition rates in the millisecond regime, using the electrochemical dissolution of Au(001) in Cl-containing solution as an example. This progress in time resolution permits monitoring of atomic-scale growth and etching processes at solid-liquid interfaces at technologically relevant rates. Au etching was found to proceed via a layer-by-layer mechanism in the entire active dissolution regime up to rates of ~20 ML/s. Furthermore, we demonstrate that information on the lateral surface morphology and in-plane lattice strain during the electrochemical process can be obtained. 相似文献
30.
Jochim S Bartenstein M Hendl G Denschlag JH Grimm R Mosk A Weidemüller M 《Physical review letters》2002,89(27):273202
We study elastic collisions in an optically trapped spin mixture of fermionic lithium atoms in the presence of magnetic fields up to 1.5 kG by measuring evaporative loss. Our experiments confirm the expected magnetic tunability of the scattering length by showing the main features of elastic scattering according to recent calculations. We measure the zero crossing of the scattering length at 530(3) G which is associated with a predicted Feshbach resonance at approximately 850 G. Beyond the resonance we observe the expected large cross section in the triplet scattering regime. 相似文献