Materials Literature
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The composition, structure, and morphology of ultrathin films grown by Ag deposition on Cu(110) were monitored as a function of temperature using low-energy electron diffraction (LEED), Auger electron spectroscopy (AES), and medium-energy ion scattering (MEIS). Aligned backscattering measurements with 150 keV He ions…
Thick overcoats of SiO2 sputtered at high deposition rates in a radio-frequency (rf) diode system are being considered as alternatives to Al2O3 and photoresist as passivation and planarization layers in the fabrication of thin film magnetic recording heads. The mechanical properties of 7-μm thick SiO2 films sputtered…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation David Lichtman; Residual gas analysis: Past, present, and future. J. Vac. Sci. Technol. A 1 May 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolarization-selective photochromic reaction in glassy polymers: effects of local relaxation processes of polymer matrixQui Tran Cong, T. Kumazawa, O. Yano, and T. SoenCite this: Macromolecules 1990, 23, 11, 3002–3005Publication Date (Print):May 1, 1990Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of excited-state geometries via the time-dependent theory of resonance Raman spectroscopy: application to the complexes Cs4[W2OCl10] and Cs3[Re2OCl10]Kyeong Sook Kim Shin, Robin J. H. Clark, and Jeffrey I. ZinkCite this: J. Am. Chem. Soc. 1990, 112, 10, 3754–3759…
The interaction of solid molecular oxygen Li, Cs, K, La, Ag, Cu, and Ba has been studied at 35 K or below using photoemission. A feature near 535 eV in the O ls core level spectra was observed when Li, Cs, K and La were deposited on solid oxygen. This feature was identified with one electron being donated to an oxygen…
Computer programs have been developed to predict temperature coefficients of saturation magnetization for (Sm1−xGdx)2Tm17 magnets with higher Fe content from temperature-dependent magnetic properties of single rare-earth compositions. Very good agreement was obtained between the calculated and measured data. The compo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFilterability of gypsum crystallized in phosphoric acid solution in the presence of ionic impuritiesDavid Hasson, Jonas Addai-Mensah, and John MetcalfeCite this: Ind. Eng. Chem. Res. 1990, 29, 5, 867–875Publication Date (Print):May 1, 1990Publication History Published online…
Starting from the typical wear mechanisms encountered in centrifugal slurry pumps, the paper outlines a computational approach for wear distribution in the pump channels. The two-phase flow parameters (solid concentration, velocity, particulate stresses) at the wetted walls are related to the wear distribution as a fu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInhibition of C2 oxidation by methane under oxidative coupling conditionsJohn C. Mackie, Julie G. Smith, Peter F. Nelson, and Ralph J. TylerCite this: Energy Fuels 1990, 4, 3, 277–285Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published…
CH3OD decomposition has been studied over the stoichiometric, nonpolar (111) and polar, copper‐terminated (100) surfaces of Cu2O. Thermal desorption studies for monolayer coverages of methanol at 90 K show similar conversions, but the product distributions vary significantly, indicating a structure sensitive reaction.…
The analytic formula for the third-order hyperpolarizability γijkl(-3ω;ω,ω,ω) is derived from time-dependent perturbation theory. An approximate formula for γijkl in a static electric field is also presented. The γzzzz values (the chain axis components) for regular polyenes, charged polyenes, donor (D) - acceptor (A)…
Palladium establishes the Pd 2+ –Pd 0 redox equilibrium in a reference alkali borosilicate melt. Most of the palladium exists as the insoluble metal, with only a small fraction of the palladium present as the divalent palladium ion dissolved in the melt. The relative reduction potential of this Pd 2+ –Pd 0 redox coupl…
The Stoner theory of itinerant ferromagnetism was used in calculating the magnetic properties of iron within the self-consistent linear muffin-tin orbital approach. The Stoner exchange parameter, I, was found from the linear-response theory as a function of volume and then adjusted by a constant enhancement factor det…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of macrocyclic poly(oxymethylene) with narrow molecular weight distribution on the lamellar crystalsMasaki Hasegawa, Kaoru Yamamoto, Toshio Shiwaku, and Takeji HashimotoCite this: Macromolecules 1990, 23, 10, 2629–2636Publication Date (Print):May 1, 1990Publication…
Lead titanate ceramics were successfully made into semiconductors exhibiting anomalous positive temperature coefficients of resistivity (PTCR) about 3 orders of magnitude above the Curie point (480° to 490°C). The PTCR characteristics of the materials prepared were found to be unstable and to show a significant degrad…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of catalysts on the kinetics of reduction of barite by carbonSatish B. Jagtap, Anita R. Pande, and Ashok N. GokarnCite this: Ind. Eng. Chem. Res. 1990, 29, 5, 795–799Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCytotoxic hydroperoxylepidozenes from the actinia Anthopleura pacifica UchidaGuo Chi Zheng, Akio Ichikawa, Midori O. Ishitsuka, Takenori Kusumi, Hiroshi Yamamoto, and Hiroshi KakisawaCite this: J. Org. Chem. 1990, 55, 11, 3677–3679Publication Date (Print):May 1, 1990Publicat…
X-ray photoelectron spectroscopy (XPS) and high resolution electron energy loss spectroscopy (HREELS) have been used to study the adsorption of polyimide precursor molecules on Ni(110). PMDA (1,2,4,5-benzenetetracarboxylic anhydride) and m-PDA (1,3-phenylenediamine) were vapor deposited in vacuo at substrate temperatu…
Abstract The 1 H-NMR results show that the majority of the isoprene units of butyl rubber are incorporated in 1,4 addition. Approximately 6% of the isoprene units undergo 1,2 enchainment. Based on our study of blends of polyisoprene with polyisobutylene, 1 H-NMR provides an excellent method for determining isoprene un…