Materials Literature
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The effect of surface plasmon generation on the reflectivity of thin metal films in attenuated-total-reflection prism configurations has been described as a means of determining the film dielectric function and thickness. Although this technique is capable of yielding accurate values for the film parameters with relat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of porphyrin reduction and decomposition in a high-pressure chemical ionization plasmaGary J. Van Berkel, Gary L. Glish, Scott A. McLuckey, and Albert A. TuinmanCite this: J. Am. Chem. Soc. 1989, 111, 16, 6027–6035Publication Date (Print):August 1, 1989Publication…
We developed a two-target rf-magnetron sputtering system to reproducibly fabricate bright ZnS:TbOF thin-film green electroluminescent panels. ZnS and Tb are sputtered from independent targets, and the substrate moves between these targets. This results in good controllability of both ZnS thickness and Tb doping concen…
Ninety compounds, over seventy of which are members of a number of homologous series of three-ring esters containing a 5-membered heteroaromatic ring, have been synthesized in order to establishhow a change in the position of the heterocyclic ring influences liquid crystal behavior when comparedwith corresponding all-…
Abstract The photochemistry of an appropriately substituted bisimide has been studied in solution by conventional means and time resolved laser techniques as a model for the behavior of inherently photosensitive solvent soluble polyimides, whose photochemistry are not well understood. A mechanism for the photochemical…
Nuclear reaction analysis and ion implantation techniques were used to investigate the trapping of deuterium (D) by He bubbles and implantation defects in Ta. A series of four complementary temperature ramp experiments have enabled us to determine that: (1) the binding enthalpy of D at trap sites associated with He bu…
The geometric theory of imaging for spectrometer systems is extended to include those with diffraction gratings produced holographically by the intersection of two sets of spherical wave fronts that have been rendered aspheric through reflection from concave mirrors. Aberration coefficients are derived that reduce to…
Etude par spectroscopie Raman et diffraction RX. Observation d'un pic Raman a 506 cm −1 specifique d'un cycle comportant quatre tetraedres silicate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEfficient syntheses of dioxorhenium(V) complexesJohn C. Brewer and Harry B. GrayCite this: Inorg. Chem. 1989, 28, 17, 3334–3336Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August 1989https://pubs.acs.org/doi/10.1021…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin density in the heterodinuclear compound Cu(salen)Ni(hfa)2: a polarized neutron diffraction studyBeatrice Gillon, Christian Cavata, Peter Schweiss, Yves Journaux, Olivier Kahn, and Daniel SchneiderCite this: J. Am. Chem. Soc. 1989, 111, 18, 7124–7132Publication Date (Pri…
Abstract Adsorption of p -hydroxybenzoate anion on synthetic Fe oxides, hydroxides, and oxyhydroxides (hereafter referred to as oxides) was measured at pH 5.5, and the organic-oxide interaction was characterized using diffuse-reflectance Fourier-transform infrared (DRIFT) spectroscopy. Surface complexes with ferrihydr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn evaluation of the substrate specificity, and of its modification by site-directed mutagenesis, of the cloned L-lactate dehydrogenase from Bacillus stearothermophilusMarcel A. Luyten, Daniel Bur, Hla Wynn, Wendy Parris, Marvin Gold, James D. Friesen, and J. Bryan JonesCite…
Abstract Triclinic II b -4 and monoclinic II b -2 clinochlore polytypes from Kenya are intergrown laterally in (001) platelets and are separated optically in some places by sharp lines of demarcation and in other places by embayed boundaries. Electron microprobe analyses show no compositional differences between the t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKeto-enol tautomerism and vibrational spectra of phenylpyruvic acidsKazuhiko Hanai, Akio Kuwae, Satoshi Kawai, and Yoko OnoCite this: J. Phys. Chem. 1989, 93, 16, 6013–6016Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue…
The proton NMR spectra of a variety of low-spin and high-spin ferric complexes of the naturally occurring chlorin derivative pyropheophorbide a methyl ester have been recorded and assigned. The complete assignments for the low-spin, dicyano complex were effected by a combination of partial isotope labeling, paramagnet…
Ligands such as complexing organic acids play a significant role in the dynamics of release of plant nutrients in soils. The objective of this work was to study the dynamics of slowly exchangeable K and Mg release from 12 Quebec soils by ten successive extractions with 5 × 10 −4 M citric acid, over a period of 1800 h,…
The method of strained coordinates is applied to the inward solidification problem. Constant thermal properties are assumed throughout the analysis for the liquid, which is initially at the fusion temperature. A unified approach is adopted that allows the simultaneous treatment of the problem in plane, cylindrical, an…
For momentum transfers of order 6 A${\r{}}^{\mathrm{\ensuremath{-}}1}$ nondipole transitions can make the same contribution to inner-shell energy-loss spectra as dipole transitions. Nondipole transitions are particularly significant when there is a high density of dipole-forbidden states in the near-threshold region.…
The densification and shear behavior of glass powder compacts were determined by measuring their axial strain and radial strain during uniaxial compression. The experiments were conducted nonisothermally at constant rates of heating. The densification and the shear strain were plotted as a function of temperature. Bot…
A theory is presented for estimating the stopping of bound electrons, whose internal system described in momentum space is considered as a dense interacting electron gas with a Gaussian occupation probability. With the use of an alternative type of random-phase-approximation dielectric function proposed herein, the sh…