Materials Literature
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<div class="htmlview paragraph">Studies were conducted using spark-ignited reciprocating engines to evaluate ammonia as an alternate fuel for certain military applications. Conventional engines were found to perform poorly on ammonia. Several practical methods for improving engine performance while burning ammon…
The characteristics of the ``synchrotron light'' emitted by electrons in the NBS 180-MeV electron synchrotron were studied in detail. The electron beam cross section was approximately 1×2 mm. The angular distribution and polarization properties were determined for the visible radiation; photoelectric techniques result…
CONTENTS I. Introduction 46 II. Short description of the methods for the preparation of pyrographite 47 III. Physicochemical processes occurring during the preparation of pyrographite 47 IV. Structure of pyrographite 50 V. Properties of pyrographite 52 VI. Uses of pyrographite 56
Abstract The acid strengths of organometallic compounds were determined by the color reactions with H AMMETT indicators. The acid strength of triethylaluminum was enhanced by the modification with water. The triethylaluminum/water system showed the maximum acid strength at about 1:1 molar ratio of water/triethylalumin…
Abstract A new technique for performing electron nuclear double resonance experiments, based on the observation of electron spin echoes, has been developed. Radio-frequency resonance transitions are induced during the time interval between pulses II and III of a stimulated echo sequence, and cause a fall in the echo s…
A family of synthetic elastic fibers, designated spandex fibers, has been developed, providing new degrees of sheerness and effective "power" in elastic fabrics. These fibers have segmented polyurethane structures. They are durable, they are white and accept dye readily, and they can be set by heat. The development of…
Experimental results concerning electron ejection from the atomically clean (111) face of nickel by singly charged ions of He, Ne, and Ar are reported. Total yield and kinetic-energy distribution of ejected electrons were measured as functions of ion energy in the range 4 to 100 eV. Revised experimental procedures hav…
The Raman spin-lattice relaxation time ${T}_{1R}$ for the oxygen divacancy (${{E}_{1}}^{\ensuremath{'}}$) center in synthetic crystalline quartz measured in applied magnetic fields of 3 kOe is accurately given by $\frac{1}{{T}_{1R}}=B\frac{{e}^{{x}_{1}}}{{({e}^{{x}_{1}}\ensuremath{-}1)}^{2}}+C\frac{{e}^{{x}_{2}}}{{({e…
Received 18 December 1964DOI:https://doi.org/10.1103/PhysRevLett.14.71©1965 American Physical Society
A theoretical analysis is made of the effect of an external perturbation, such as an electric field, magnetic field, or stress, on the optical properties of color centers. Our analysis is restricted to centers with orbital singlet ground states. It is especially applicable to centers with orbitally degenerate excited…
The rate of self-diffusion in gold was measured by the radioactive-tracer-lathe-sectioning technique at 860, 910, and 960\ifmmode^\circ\else\textdegree\fi{}C and at hydrostatic pressures from 2.00 to 9.08 kbar. The diffusion rate was observed to decrease with increased pressure, and the activation volume for self-diff…
Neutron diffraction techniques have been employed to study the hydrogen-atom configuration in a single-phase sample of beta-PdH at several selected temperatures. The suggested low-temperature ($T\ensuremath{\ll}55\ifmmode^\circ\else\textdegree\fi{}$K) structure of this compound is one which conforms to the space group…
Received 14 December 1964DOI:https://doi.org/10.1103/PhysRevLett.14.64©1965 American Physical Society
The Raman spectra of AlCl3·KCl (solid and liquid) and AlCl3·NaCl (liquid) were recorded using a Cary 81 Raman spectrophotometer. Both solid and liquid AlCl3·KCl exhibit nine Raman lines. For liquid AlCl3·NaCl, only four Raman lines were observed. Polarization measurements indicate the existence of the complex species…
Magnetic susceptibility of (pyridine N-oxide)-copper(II) chloride, C5H5NOCuCl2, has been measured by the Faraday method from 90° to 300°K. The magnetic moment decreases rapidly with temperature; the dimeric structure proposed on the basis of magnetic behavior has been confirmed by the results of crystal structure dete…
Low-energy inelastic collisions between electrons and hydrocarbon molecules are studied by means of a trapped-electron technique. Excitation spectra are obtained over the subionization energy range for methane, ethane, ethylene, propylene, acetylene, propyne, and 1-butyne. Molecular excitation potentials are measured,…
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 J. A. Partridge, C. E. May; Anomalous Thermoluminescent Kinetics of Irradiated Alkali Halides. J.…
A beryllium pressure vessel mounted in an X-ray diffractometer has been used to study the rates of the transformation calcite ⇌ aragonite at temperatures to 500°C and pressures to 15 kb. The rates of transformation are shown to be both temperature and pressure dependent. It is proposed that the tail-off shown by all r…
Secondary electron emission yields have been measured for cesium ions on clean molybdenum as a function of ion kinetic energy for two angles of incidence. For the two incidence angles measured 0 and 40\ifmmode^\circ\else\textdegree\fi{}, the energy threshold was the same, approximately 2 keV. From this threshold there…
Measurements of the magnetoacoustic attenuation of bismuth at temperatures of 1.4-1.8\ifmmode^\circ\else\textdegree\fi{}K in transverse magnetic fields up to 17 kG are reported. For shear waves of frequency 8-40 Mc/sec, propagated in the bisectrix direction, with the magnetic field in the binary direction, oscillation…