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排序方式: 共有331条查询结果,搜索用时 232 毫秒
1.
Observation of a quadrupole plasmon mode for a colloidal solution of gold nanoprisms 总被引:3,自引:0,他引:3
Millstone JE Park S Shuford KL Qin L Schatz GC Mirkin CA 《Journal of the American Chemical Society》2005,127(15):5312-5313
The synthesis and optical properties of single crystalline gold nanoprisms have been investigated. A three-step mediated seed growth process in an aqueous solution generated gold nanoprisms with a relatively homogeneous size distribution. The purity of these nanostructures has allowed us to observe a weak quadrupole resonance in addition to a strong dipole resonance associated with these novel structures. The experimental optical spectra agree with discrete dipole approximation calculations that have been modeled from the dimensions of gold nanoprisms produced in this synthesis. 相似文献
2.
Constantinides CP Koutentis PA Schatz J 《Journal of the American Chemical Society》2004,126(49):16232-16241
Unrestricted density functional calculations in combination with the broken-symmetry approach and spin-projection methods have been employed to study a series of formally 4n pi antiaromatic linear and angular polyheteroacenes. Calculations show that the linear polyheteroacene molecules have either stable singlet zwitterionic 6-9 or singlet diradical 5 ground states because they sacrifice the aromaticity of the central arene to form two independent cyanines. The corresponding angular compounds 10-14 have robust triplet states, since they cannot create independent cyanines to escape their overall antiaromaticity. An analysis based on the SOMO-SOMO energy splittings, their spatial distributions, and the spin density populations for the triplet states is presented to clarify the factors that determine their ground state multiplicities. 相似文献
3.
4.
Haes AJ Zhao J Zou S Own CS Marks LD Schatz GC Van Duyne RP 《The journal of physical chemistry. B》2005,109(22):11158-11162
A novel method to produce solution-phase triangular silver nanoparticles is presented. Ag nanoparticles are prepared by nanosphere lithography and are subsequently released into solution. The resulting nanoparticles are asymmetrically functionalized to produce either single isolated nanoparticles or dimer pairs. The structural and optical properties of Ag nanoparticles have been characterized. Mie theory and the Discrete Dipole Approximation method (DDA) have been used to model and interpret the optical properties of the released Ag nanoparticles. 相似文献
5.
Two methods for implementing angular momentum decoupling approximations in quantum mechanical reactive scattering examined. Applications of both reactive and nonreactive H + H2 collisions indicate that for the most intense individual reactive transitions and for all degeneracy-averaged ones, these decoupling methods (especially the “proper” decoupling method) yield results in good agreement with those of fully-coupled calculations. However, for the less intense reactive transitions and all individual nonreactive transitions, very large errors can result from use of these approximate methods. 相似文献
6.
Assignment of π → 3d rydberg transitions in ethylene around 9 eV using MCD and synchrotron radiation
Magnetic circular dichroism measurements on ethylene are reported over the region of the 3R00 and 4R00? origins around 9 eV. The results show conclusively that each origin is a composite of two electronic transitions. The 3R00 origin is assigned to the Rydberg transitions, tA1 → 1B2(3dδ) + 1B3(3dδ). 4R00? is assigned as 1A1 → 3R00 + ν3(u). 相似文献
7.
Intrazelluläre Lokalisierung und Funktion von NADPH-Cytochromc-Reduktase in Saccharomyces cerevisiae
Gottfried Schatz 《Monatshefte für Chemie / Chemical Monthly》1963,94(5):927-934
Zusammenfassung Das Flavoprotein NADPH-Cytochromc-Reduktase aus Hefe ist im Gegensatz zu bisherigen Anschauungen kein Enzym der mitochondralen Atmungskette, sondern an bisher unbekannte subzelluläre Partikel gebunden, die nach Homogenisieren der Hefezellen von den Mitochondrien abgetrennt werden können. Die Beteiligung von Cytochromb
2 oder einer Transhydrogenase-reaktion an der Elektronenübertragung von NADPH auf Cytochromc in einem Hefehomogenat konnte ausgeschlossen werden. Die Natur der neuen Hefepartikel sowie die physiologische Funktion des Enzyms NADPH-Cytochromc-Reduktase werden diskutiert.Abkürzungen NADPH
reduziertes Nikotinamid-adenin-dinukleotidphosphat
- NADH
reduziertes Nikotinamid-adenin-dinukleotid
- Tris
Tris-(hydroxymethyl)aminomethan
- BAL
1,2-Dimercapto-3-hydroxypropan
- RNase
Ribonuklease
- ATPase
Adenosintriphosphatase
- EDTA
Äthylendiamintetraessigsäure
Mit 2 Abbildungen 相似文献
8.
9.
Morenzoni E. Birke M. Hofer A. Kottmann F. Litterst J. Matthias B. Meyberg M. Niedermayer Ch. Prokscha Th. Schatz G. Wutzke Th. 《Hyperfine Interactions》1996,97(1):395-406
During the last few decades, a variety of methods has been developed which makes use of polarized positive muons as a microscopic probe of the magnetic properties of condensed matter (muon spin rotation, relaxation, resonance,SR). Until now, available beams for SR studies have delivered 100% polarized muons with energies in the MeV range, resulting in a deep penetration of the muons into the sample material under investigation. This presently limits the applications of theSR technique to the study of the bulk characteristics of matter. To be able to control the implantation depth, a very low energy beam of polarized muons is being developed at the Paul Scherrer Institute. Very slow polarized muons (kinetic energy 10 eV, polarization 90%) are obtained from the moderation of a high energy muon beam in a thin film of an appropriate condensed gas. These muons can be used as a source for a beam of tunable energy between a few tens of eV and some tens of keV. Implantation depths in the range of few to a few hundreds of nanometers can thus be achieved by varying the energy. 相似文献
10.
G. Krausch J. Colchero T. Detzel R. Fink B. Luckscheiter U. Wöhrmann G. Schatz 《Hyperfine Interactions》1993,78(1-4):295-301
Thin In films on Ge(100), Si(100) andSi(111) are investigated using Auger-electron spectroscopy (AES), atomic force microscopy (AFM) andperturbed -angular correlation (PAC) spectroscopy, respectively. The growth mode of the metal films is characterized by in situ AES measurements, indicating distinct differences between the different substrate surfaces. Additional AFM investigations are used to monitor the film topography at higher metal coverage. Finally, the local crystalline structure of the films is studied by the PAC technique. 相似文献