Materials Literature
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A sharp peak in the two-phonon Raman spectrum of diamond was first observed by Krishnan and has recently been shown to be at a frequency higher than twice the maximum single-phonon frequency by Solid and Ramdas. We interpret this peak as evidence for the existence of bound states of the two-phonon system. The repulsiv…
X-ray photoelectron spectra indicate core-electron binding-energy splittings of \ensuremath{\sim}6 eV for the $3s$ levels in Mn${\mathrm{F}}_{2}$, MnO, and Fe${\mathrm{F}}_{3}$, and less pronounced effects on the $3s$ levels in Mn${\mathrm{O}}_{2}$ and Fe metal. These splittings are considerably reduced from free-ion…
A first-order metal-insulator transition at room temperature has been found in Cr-doped ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ as a function of both Cr concentration and pressure. This is shown to be a Mott transition in which the conduction electrons localize to form the insulator. A generalized phase diagram relating…
p-Chlorophenylalanine depletes brain serotonin and induces longlasting sexual excitation in male rats. The effect of p-chlorophenylalanine is potentiated by pargyline. Administration of 5-hydroxytryptophan to rats treated with p-chlorophenylalanine plus pargyline blocks the sexual excitation. p-Chlorophenylalanine als…
${\mathrm{Ca}}_{2}$Mn${\mathrm{O}}_{4}$ shows anomalous magnetic-susceptibility behavior rather similar to that of the isostructural fluoride ${\mathrm{K}}_{2}$Ni${\mathrm{F}}_{4}$, in which the existence of long-range two-dimensional character has recently been clearly demonstrated. A powder-diffraction study of ${\m…
Measurements have been made of the photoelectric yield and the photoelectron energy distribution curves (EDC's) on Na and K in the photon energy range 2.3-11.6 eV. The samples were thick films prepared by evaporation onto various substrates in a specially constructed ultrahigh vacuum chamber. The results are interpret…
Article A reinvestigation of the crystal structure of ammonium persulfate, (NH4)2S2O8 was published on December 1, 1969 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 130, issue 1-6).
The idealized geometry of a looped-pile carpet is analyzed. Mechanisms of deformation are outlined, and the limiting conditions for each mechanism are discussed. Expressions are derived for both the initial and final geometries of the loop. Strain levels in the fibers in a deformed carpet are predicted, and the result…
If an obstacle exists in the vicinity of the free surface of a half-space and a stress field is applied in such a manner that dislocations are pushed towards the obstacle, an array of dislocations then piles up into an equilibrium distribution against the obstacle. The distributions of dislocations are obtained by the…
Abstract The present investigation was undertaken in an attempt to determine the role played by the nerve in the regeneration of the lower jaw of the adult newt, Triturus viridescens . The results indicated that the number of nerve fibers normally available at the amputation surface was very low compared with that of…
Abstract Samples of white soft paraffin complying with pharmacopoeial requirements vary in their physical properties. Some samples produce hard waxy lumps and permit excessive separation of liquid components (bleeding). Measurement of melting and congealing points and consistency by penetrometer failed to reveal these…
The mineral phases and the distribution of major, minor and trace elements in the clays and bed rocks of two bore-holes at Adda and Chaubatta of the Birbhum area have revealed an intimate relationship of the kaolin-rich clays with the bed-rock of Adda. The possibility of a common origin for the clay deposits at Chauba…
Measurement of difference in amplitude of components at about 51.75 degrees and 51.40 degrees 2theta (Co Kalpha radiation) of the asymmetric X-ray diffraction peak resulting from partial superposition of strong diffractions from corresponding planes in hexagonal and monoclinic pyrrhotite structures allows rapid quanti…
A new technique, based on the nuclear activation reaction 15 N(α, n) 18 F, was used to measure nitrogen self‐diffusion coefficients in UN. Temperatures were 1700° to 2000°C and N 2 pressures 7 to 603 torr. The diffusion coefficients were in fair agreement with those obtained by the gaseous exchange method in an indepe…
Optical absorption spectrum measurements and spectral details are presented together with transition assignments and other interpretations for a lemon-yellow gem-quality specimen of iron-rich orthoclase. Only three principal bands--26500, 24000, and 22600 cm (super -1) --are resolved in the spectrum and are tentativel…
New taxa are described as follows: Ralfsia confusa sp. nov., Ralfsia integra sp. nov., Pseudolithoderma nigra sp. nov., Diplura simulans gen. et sp. nov., Endoplura aurea gen. et sp. nov. Lithodermataceae is included in Ralfsiaceae. An emended description of Ralfsia californica is given. Distributional records are als…
A simple homogeneous-field magnetic prism spectrometer is described for use below the camera chamber of a conventional transmission electron microscope. The prism is designed for point-to-point focusing from the exit pupil of the electron microscope to the exit slit of the spectrometer. Energy spectra are scanned by v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the structure of the pyrosulfite ion in aqueous solution using Raman and infrared spectroscopiesAlbert W. Herlinger and Thomas Veach Long IICite this: Inorg. Chem. 1969, 8, 12, 2661–2665Publication Date (Print):December 1, 1969Publication History Published o…
Abstract Magnesium carbonate powder and granules were compressed and the tablets characterized by their permeability to air and penetration by liquids. To the same materials, magnesium stearate was added, its distribution being varied by varying its concentration, the size of the base material and the method of mixing…
The family of spinel compounds of which CdCr2Se4is the prototype has been found to be simultaneously ferromagnetic and semiconducting. Numerous experiments reveal, moreover, that the electronic states in these materials are strongly coupled to the degree of magnetic order. The interaction between the electronic transp…