Cristallochimie du sélénium(+IV). II. Structure cristalline de ZnSe2O5
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Auger electron spectroscopy study of cathode surfaces during activation and poisoning. I. The barium-on-oxygen-on-tungsten dispenser cathode
Auger electron spectroscopic analyses of the chemical changes taking place on a commonly used dispenser cathode have been carried out during activation and poisoning by several reactive gases (O2, CO, CO2, H2, N2, Ar). The chemical composition and work-function changes on the cathode were correlated at various stages…
The Effect of Chromium on the Photosynthesis and Growth of Diatoms and Green Algae
Abstract The effect of hexavalent chromium ions on the photosynthesis and growth of the diatom Nitzschia palea and the green alga Chlorella pyrenoidosa has been studied and compared with the effect of Cu and Hg. The effect of chromium is very similar to that of Cu and Hg, but it is more than one hundred times less tox…
Analytical formulae for the inverse bremsstrahlung absorption coefficient
Simple analytical expressions for calculating the electron-ion, free-free Gaunt factor for high electron temperatures (>or=1eV/k) and long wavelengths (>or=0.1 mu m) are presented. The values of the Gaunt factor are displayed in a graphical form for wavelengths in the range 0.1-100 mu m.
The Synthesis of Zinc Silicates at 20°C and Atmospheric Pressure
Abstract Zinc silicates were synthesized under conditions analogous to surficial weathering environments. The main product, regardless of conditions of precipitation or ageing, was shown by X-ray, i.r., electron microscopic and chemical evidence to be a 2:1 layered zinc silicate equivalent of stevensite. In the presen…
The crystal structure of phlogopite by neutron diffraction
Summary The positions of all the atoms including hydrogen have been found by a partial three-dimensional single-crystal neutron-diffraction study in which about one-third of the reflections in the reciprocal sphere to 1·5 Å were measured. The hydroxyl group is perpendicular to the plane of the silicate sheets. The flu…
High pressure studies of the electronic behavior of bianthrones
High pressure optical studies have been made on a series of bianthrones dissolved in polymethyl methacrylate (PMMA). At sufficiently high pressure at room temperature, significant occupation of the photochromic (B) state occurs, but the yield is different for the different derivatives; it is especially small for the 4…
Synthesis and polymerization of 3-vinylbisfulvalenediiron. Preparation and conductivity of its polymeric [FeIIFeIII](TCNQ)2.-salts
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and polymerization of 3-vinylbisfulvalenediiron. Preparation and conductivity of its polymeric [FeIIFeIII](TCNQ)2.-saltsCharles U. Pittman Jr. and B. SurynarayananCite this: J. Am. Chem. Soc. 1974, 96, 26, 7916–7919Publication Date (Print):December 1, 1974Publicati…
Optical Absorption of Defects in V205 Single Crystals: As‐Grown and Reduced V2O5
Abstract Absorption spectra are presented of V 2 O 5 single crystals in the range 0.5 to 2.1 eV. From the behaviour of the optical absorption upon reduction, reoxidation, and annealing it follows that two different centres are active. The bands observed at 1.25 and 1.52 eV for a polarization parallel to the a ‐axis (…
Thermal Decomposition Mechanism of Formed and Cycled Lead Dioxide Electrodes and Its Relationship to Capacity Loss and Battery Failure
The structural changes accompanying capacity loss in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="ML1" overflow="scroll"> <mml:msub> <mml:mi mathvariant="normal">PbO</mml:mi> <mml:mrow> <mml:mn>2</mml:mn> </mml:mrow> </mml:msub> <mml:mo>/</mml:mo> <mml:msub> <mml:mi mathvariant="no…
Continuous and discontinuous thermochromism of copper(II) and nickel(II) complexes with N,N-diethylethylenediamine
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTContinuous and discontinuous thermochromism of copper(II) and nickel(II) complexes with N,N-diethylethylenediamineL. Fabbrizzi, M. Micheloni, and P. PaolettiCite this: Inorg. Chem. 1974, 13, 12, 3019–3021Publication Date (Print):December 1, 1974Publication History Published…
Cytidine 5′-Monophosphosialic Acid Hydrolase
CMP-sialic acid hydrolase catalyses the reaction: CMP-sialic acid → sialic acid + (CMP) Enzymatic activity was measured by following both the disappearance of substrate, CMP-[14C]sialic acid, and the appearance of product, [14C]sialic acid, after separation by ion exchange column chromatography. The stoichiometry of t…
Luminescence of Cr2+ Centres and Related Optical Interactions Involving Crystal Field Levels of Chromium Ions in Zinc Sulfide
In the i.r. emission of ZnS:Cr crystals, a zero-phonon doublet at 5211 and 5216 cm -1 and a number of vibronie bands are resolved at T ≈ 4 K. The T d symmetry of the crystal field at the Cr 2+ ion on a Zn lattice site is reduced to D 2d by a static Jahn-Teller effect. Differences in the vibronie structures of absorpti…
X-ray photoelectron spectroscopy of azaporphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopy of azaporphyrinsYoshio. Niwa, Hiroshi. Kobayashi, and Toshikazu. TsuchiyaCite this: Inorg. Chem. 1974, 13, 12, 2891–2896Publication Date (Print):December 1, 1974Publication History Published online1 May 2002Published inissue 1 December 1974ht…
Evaluation of Lattice Site and Valence of Mn and Fe in Polycrystalline PbTiO 3 by Electron Spin Resonance and Thermogravimetry
The oxides of Mn and Fe or combinations of La 2 O 3 with these oxides were incorporated into PbTiO 3 under defined thermodynamic conditions. The substitution reaction of these additives was examined gravimetrically. At low partial pressures of O 2 and PbO vapor, Mn 2+ and Fe 2+ are formed at the A sites, and Mn 3+ and…
A γ-ray diffractometer: a tool for investigating mosaic structure
A single-crystal diffractometer has been constructed for use with γ-radiation of wavelengths down to λ = 0.03 Å. The relative line width at room temperature of the 412 keV line of radioactive gold is Δλ/λ = 10−6. The angular divergence of the primary beam in the scattering plane is equal to 10′′. The wavelength is so…
The skew-symmetric two-crystal X-ray interferometer
The construction and successful operation of a Laue-case skew-symmetric two-crystal X-ray interferometer is described. The alignment is accomplished with an auxiliary X-ray beam, which is multiply reflected by both interferometer parts. As expected, the skew-symmetric two-crystal interferometer is found to be consider…
Comparison of the dielectric behavior of several Schiff-base and phenyl benzoate liquid crystals
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparison of the dielectric behavior of several Schiff-base and phenyl benzoate liquid crystalsR. T. Klingbiel, D. J. Genova, T. R. Criswell, and J. P. Van MeterCite this: J. Am. Chem. Soc. 1974, 96, 25, 7651–7655Publication Date (Print):December 1, 1974Publication History…
Efficient phonon-assisted long-lifetimeNd3+fluorescence inCs2NaNdCl6
Spectroscopic measurements are reported on single crystals of the high-${\mathrm{Nd}}^{3+}$-concentration perovskite ${\mathrm{Cs}}_{2}$NaNd${\mathrm{Cl}}_{6}$ [$\ensuremath{\rho}(\mathrm{Nd})=3.2\ifmmode\times\else\texttimes\fi{}{10}^{21}$ ${\mathrm{cm}}^{\ensuremath{-}3}$] and on ${\mathrm{Cs}}_{2}$Na${\mathrm{Nd}}_…
ESR and Optical Absorption Studies of Various Bis(N-salicylidenealkylaminato)copper(II) Complexes with Tetrahedrallydistorted Coordination Geometry
Abstract The ESR and visible absorption spectra of a number of bis(N-salicylidenealkylaminato)copper(II) complexes with different kinds of alkyl groups were measured in toluene. The coordinations of these complexes in toluene are distorted towards a tetrahedral geometry to varying extents; the relationship between the…