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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…
Abstract 1 H and 2 H NMR spectra were recorded for the paramagnetic metallocenes Cp 2 M (M = V, Cr, Mn, Co, Ni). For Cp 2 V, Cp 2 Cr, Cp 2 Mn and Cp 2 Ni, a signal narrowing factor of 36–37 is observed on going from Cp 2 M‐ h 10 to Cp 2 M‐ d 10 , which is close to simple theoretical predictions. Additional quadrupolar…
Europium oxide has been investigated as a sintering aid and dopant for AIN. Pressureless sintering was carried out with 0 to 9 wt% Eu 2 O 3 additives, and dense sintered specimens were obtained using 1 to 4 wt% Eu 2 O 3 . With increasing Eu 2 O 3 content, two additional phases were observed in the X‐ray diffraction pa…
A vanadium oxide glass has been prepared by a rapid quenching technique, and the electrochemical lithium insertion into the glass has been investigated. The open‐circuit voltage (OCV) of the lithium cell with the glass gradually is decreased with increasing the stoichiometric parameter , while OCV of crystalline has t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR study of the dynamic molecular structure of a reentrant nematic liquid crystalAkbar Nayeem and Jack H. FreedCite this: J. Phys. Chem. 1989, 93, 17, 6539–6550Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August 19…
Abstract This paper describes the development of process control schemes for the free radical initiated (reactive) degradation of polypropylene in an extruder (reactive extrusion). The objective of the work was to control the amount of degradation in order to produce polypropylene with a specified molecular weight. Th…
Direct current and alternating current electrical conductivity measurements are used to determine the activation energies for the formation of oxygen vacancies by breakup of bound defect complexes (0.32 eV) and their migration (0.84 eV) at low temperatures (<600°C) in Y 2 O 3 ‐fully‐stabilized ZrO 2 single crystals…