Measurement of the Electron Energy Spectrum Resulting from a Double Auger Process in Argon
Received 24 October 1966DOI:https://doi.org/10.1103/PhysRevLett.17.1079©1966 American Physical Society
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Molybdenum Diselenide: Rhombohedral High Pressure-High Temperature Polymorph
A three-layered rhombohedral form of molybdenum diselenide has been produced by subjecting the normal two-layered hexagonal form to pressures of 40 kilobars and temperatures of 1500 degrees C. The new form is isostructural with rhombohedral molybdenum disulfide.
The heats of combustion of graphite, diamond and some non-graphitic carbons
Abstract The heats of combustion of graphite and diamond have been redetermined in a high precision aneroid calorimeter. It is shown that the result obtained for graphite is consistent with all recently published figures with the exception of that reported by Prosen & Rossini (1944). The latter is significantly hi…
EPR in Selenium
EPR studies at X-band frequencies have been carried out between 300° and 77°K on amorphous and crystalline selenium. Dominating the spectra of the amorphous material were a large number of paramagnetic centers ∼1019/cc which contribute to an unusually broad and inhomogeneous line of width, ΔHp p∼3Kg and g=2.3 to 2.8±0…
PHASE TRANSITIONS OF ADSORBATES: 1. SPECIFIC HEAT AND DIMENSIONAL CHANGES OF THE POROUS GLASS – WATER SYSTEM
The specific heat and dimensional changes of the porous 96% silica glass – water system were measured simultaneously between −35 °C and +2 °C with coverages of 1.6, 4.0, 5.3, and 7.7 molecular layers. The specific heat of the adsorbate below the transition range was found to be higher than that of ice. No phase change…
Crystal Structure of CH3NH3NiCl3
The crystal structure of the new complex, CH3NH3NiCl3, has been determined. The compound crystallizes in the space group Cmcm with a=6.94, b=14.94, and c=5.95 Å. Each nickel ion has a distorted octahedral coordination with two chloride ions at 2.405 Å and four chloride ions at 2.351 Å. Adjacent octahedra along the c a…
INFRARED ABSORPTION OF SINGLE CRYSTALS OF ANHYDROUS SODIUM FORMATE
The infrared absorption of single crystals of sodium formate has been measured in the region of 250 cm −1 to 4 000 cm −1 . Thin sections cut perpendicular to the unique axis were employed and spectra were recorded with light polarized at various angles in this plane. It has been possible to assign unambiguously all of…
Heat Capacity of Alpha Uranium from 1.7 to 25°K
The heat capacity of high-purity alpha uranium has been determined from 1.7 to 23\ifmmode^\circ\else\textdegree\fi{}K and smoothed into previous data at 25\ifmmode^\circ\else\textdegree\fi{}K. These heat capacities are significantly lower than the values reported by other investigators. The values for $\ensuremath{\ga…
Free Energy of Displacive Ferroelectrics
A power series for the free energy is derived in the linear anharmonic approximation. This free energy is expressed in terms of a complete set of microscopic order parameters which determine the ionic displacements in the ferroelectric transition. In general this complete set of microscopic order parameters is larger…
Generation and Recombination of Holes and Electrons in Anthracene
The generation of electrons and holes in anthracene crystals by x rays from a 600-kV pulsed x-ray source was studied. The average energy deposited per electron-hole pair created $W$ was found to be 3\ifmmode\times\else\texttimes\fi{}${10}^{3}$ eV. The number of carriers generated was independent of temperature from --…
Influence of Electronic Polarization on the Optical Properties of Insulators
The Toyozawa theory of the electronic polaron and the related Haken-Schottky theory of the optical dielectric function are applied to the alkali and silver halides and to the rare-gas solids. It is found that for most of these crystals the above dynamical theories reduce to a static limit. This in turn indicates that…
Scanning Electron Microscopes: Is High Resolution Possible?
Experiments with this scanning microscope have produced extremely encouraging results so that we feel Confident in predicting high resolution and high contrast after some obvious modifications are made in the system, such as providing a good objective lens. Experience with conventional lenses indicates that the instru…
Magnetic Structures of Holmium. I. The Virgin State
Neutron-diffraction measurements have been made on single-crystal specimens of holmium at temperatures ranging from room temperature to 4.2\ifmmode^\circ\else\textdegree\fi{}K. Below the N\'eel temperature of 133\ifmmode^\circ\else\textdegree\fi{}K, the moments order in a helical structure in which the $c$ axis is the…
Pressure and Temperature Dependences of the Dielectric Properties of the Perovskites BaTiO3and SrTiO3
The dielectric properties of single-crystal and ceramic BaTi${\mathrm{O}}_{3}$ and of single-crystal SrTi${\mathrm{O}}_{3}$ were investigated as functions of hydrostatic pressure to 25 kbar and temperature to 150\ifmmode^\circ\else\textdegree\fi{}C. The Curie point of BaTi${\mathrm{O}}_{3}$ decreased linearly with inc…
Exchange Interactions in Ferromagnetic Chromium Chalcogenide Spinels
Transition-metal spinels with magnetic ions solely on the octahedral sites have been the subject of many investigations. The properties of such spinels had always been found to be dominated by antiferromagnetic interactions. In this paper we describe the properties of a group of spinels in which ferromagnetic interact…
A chemical means of distinguishing between conjugated and conjugated bonds
Abstract Polymers which contain conjugated bonds (polyenes) cannot be distinguished from polymers containing conjugated bonds (polyimines) by spectral means alone. A chemical means has been found for distinguishing between polyenes and polyimines. Polyenes can be hydrogenated with the aid of palladium supported on cha…
Optical Nonlinearities due to Mobile Carriers in Semiconductors
Optical nonlinearities due to conduction-band electrons have been observed in InAs, InSb, GaAs, and PbTe using 10.6-\ensuremath{\mu} (${\ensuremath{\omega}}_{1}$) and 9.6-\ensuremath{\mu} (${\ensuremath{\omega}}_{2}$) radiation from a $Q$-switched C${\mathrm{O}}_{2}$ laser. Difference frequencies ${\ensuremath{\omega}…
Theory of Optical Mixing by Mobile Carriers in Semiconductors
Received 4 October 1966DOI:https://doi.org/10.1103/PhysRevLett.17.1015©1966 American Physical Society
Monovalent Samarium in Potassium Chloride
Potassium chloride crystals have been doped with ${\mathrm{Sm}}^{2+}$ ions to concentrations of 5\ifmmode\times\else\texttimes\fi{}${10}^{19}$ ${\mathrm{cm}}^{\ensuremath{-}3}$, resulting in identifiable ${\mathrm{Sm}}^{2+}$ absorption spectra. Heating of the doped crystals in K vapor produces no visible change in the…
Significance of PRI in Raw and Vulcanized Natural Rubber
Abstract The Plasticity Retention Index (PRI) has been developed as an objective test for the oxidizability of raw natural rubber and has recently been associated with the Standard Malaysian Rubber Scheme. Oxidizability as measured by PRI significantly affects behavior of rubber in the factory and in service performan…