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Electron scattering lengths, or escape depths, have been compiled from the literature for twenty different materials in the energy range 0–3000 eV. The energy dependence of the escape depth and its implications for interpretation of photoemission and Auger-electron data are discussed. 相似文献
123.
See KC Spicer JB Brupbacher J Zhang D Vargo TG 《The journal of physical chemistry. B》2005,109(7):2693-2698
The interband transition contributions to the optical properties of silver nanoparticles in fluoropolymer matrices are investigated. For the materials in this study, nanoparticle synthesis within the existing polymer matrix is accomplished using an infusion process that consists of diffusing an organometallic precursor gas into the free volume of the fluoropolymer and decomposing the precursor followed by metal nanoparticle nucleation and growth. The resulting polymer matrix nanocomposite has optical properties that are dominated by the response of the nanoparticles owing to the broadbanded transparency of the fluoropolymer matrix. The optical properties of these composites are compared to Maxwell-Garnett and Mie theory with results indicating that interband transitions excited in the silver nanoparticles affect the optical absorption over a range of frequencies including the surface plasmon resonance. It is shown that calculations of the optical absorption spectrum using published data for the silver dielectric function do not accurately describe the measured material response and that a classical model for bound and free electron behavior can best be used to represent the dielectric function of silver. 相似文献
124.
Modeling the ultrasound generated by a laser source is critical for using noncontact laser-generated ultrasonic systems for the characterization of material properties. In this work, a laser line source was modeled and verified experimentally by measuring the ultrasonic shear wave signal generated in aluminum with a broadband laser generation/electromagnetic acoustic transducer (EMAT)-detection system. Results of calculations and experiments show that the amplitude directivity of a laser line source is identical to that of a point source in the plane perpendicular to the line axis while the temporal dependence differs. 相似文献
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Ramnial T Abernethy CD Spicer MD McKenzie ID Gay ID Clyburne JA 《Inorganic chemistry》2003,42(5):1391-1393
The structure of 1,3-bis(2,4,6-trimethylphenyl)-imidazol-2-ylidene-silver(I) chloride, 1, has been determined to be a monomer with weak head-to-tail H...Cl interactions in the solid state. A multinuclear NMR study using a (13)C(carbene) labeled derivative, 1((13)C), exhibits (13)C-(107,109)Ag coupling in solution. Further, the solid state CP/MAS NMR parameters, including the principal components of the chemical shift tensors for both the (13)C and (109)Ag centers, have been determined. With the aid of DFT calculations, the orientation of the chemical shift tensors have been assigned. 相似文献
128.
M. A. Chaudhri G. Burns E. Reen J. L. Rouse B. M. Spicer 《Journal of Radioanalytical and Nuclear Chemistry》1977,37(1):243-253
A simple method for calculating the sensitivity for detecting a nuclide distributed uniformly in any given matrix through
charged particle activation is described. This method takes into account the actual values of the reaction cross section at
different energies as the beam traverses through a thick target and the corresponding stopping power values. The detection
sensitivity for fluorine in a number of matrices through the19F(p, αγ)16O reaction have been calculated as a function of the energy from threshold to 4.16 MeV using this method and the sensitivity
curves plotted. The sensitivity values (dps/ppm/μA) for a thick or thin target and even for a layer of known thickness at
a particular depth within a sample can be directly read from these curves for known bombarding conditions. The comparator
methods for charged particle activation analysis of RICCI1 and of CHAUDHRI,2 especially when the matrices of the sample and standard are different, have been compared in the case of F determination
through the19F(p, αγ)16O reaction. It has been found that the errors are reduced by almost a factor of two when the latter method is used compared
to the former one. The fluorine concentration in animal bones and teeth, apatite crystal, and rocks have been determined through
the19F(p, αγ)16O reaction using the Melbourne University Pelletron. 相似文献
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