Application of Collective Treatment of Electron and Ion Vibrations to Theories of Conductivity and Superconductivity
Received 21 September 1951DOI:https://doi.org/10.1103/PhysRev.84.836.2©1951 American Physical Society
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Measurement of Multiple Scattering of 15.7-Mev Electrons
The angular distribution of electrons scattered by thin Be and Au foils has been measured for angles where the multiple scattering is important. The $\frac{1}{e}$ widths of the distributions obtained with Au foils of 18.66 and 37.28 mg/${\mathrm{cm}}^{2}$ are 2.58\ifmmode^\circ\else\textdegree\fi{} and 3.76\ifmmode^\c…
A Note on the Propagation of Excitation in an Idealized Crystal
It is shown that, in insulators, overlapping of the electronic wave functions of near-by crystal constituents is not necessary for effective transfer of excitation energy by the "exciton" mechanism. The electromagnetic interaction of the "virtual" dipoles of the transition is sufficient to give rise to such transfer c…
The Physical Properties of Cuprous Sulfides-Semiconductors
Cuprous sulfide has been observed to have two transition points at about 110°C and 470°C respectively, of which the latter one has been found out experimentally by the writer. The exsistence of the phase transition at 470°C has been confirmed experimentally by the measurements of electronic and ionic conductivity, the…
Theory of the Specific Heat of Graphite
The graphite crystal is considered as a system of thin elastic plates spaced at a constant distance. An elastic force is assumed to act between each neighboring plates in such a way that a local change of the spacing between them produces at that point a tension or a pressure normal to the plates whose magnitude is pr…
Zur Kenntnis der Kieselsäuren. VII. Über Kieselsäurederivate der Dioxybenzole
Abstract Bei der Umsetzung von SiCl 4 mit Brenzcatechin, Resorcin und Hydrochinon werden neue Kieselsäurederivate erhalten. Bei ihnen erfolgt unter Entstehung von Polymeren die Verknüpfung der Siliciumatome nicht wie bei Siloxanen oder Polyestern über ein einfaches O‐Atom, vielmehr werden Brücken aus –OC 6 H 4 O‐Gru…
Das System Ge/Geo/GeO2
Abstract GeO wird durch Sublimation im Vakuum aus GeO 2 + Ge hergestellt. Die Bildungswärme von festem GeO wird durch Umsatz mit einer flußsauren Lösung von AgClO 4 zu 77,2 kcal bestimmt (§ 3). Die Sublimationsdrucke von GeO werden zwischen 900 und 1000° K mit einer statischen Methode gemessen und die Verdampfungswärm…
The crystal structure of amesite and its thermal decomposition
Araesite, for long regarded as a chlorite and accepted as an end-member in classifications of these minerals, was first stated to have a kaolin-type structure by Gruner from considerations of 00l reflexions. Single crystals have been obtained yielding rotation diagrams sufficiently good to justify a structure analysis…
Preparation and Properties of Hexaaryldisilanes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Properties of HexaaryldisilanesHenry Gilman and G. E. DunnCite this: J. Am. Chem. Soc. 1951, 73, 11, 5077–5079Publication Date (Print):November 1, 1951Publication History Published online1 May 2002Published inissue 1 November 1951https://pubs.acs.org/doi/10.1…
X-Ray Photoelectron Spectrometer for Chemical Analysis
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Photoelectron Spectrometer for Chemical AnalysisRalph Steinhardt and Earl SerfassCite this: Anal. Chem. 1951, 23, 11, 1585–1590Publication Date (Print):November 1, 1951Publication History Published online1 May 2002Published inissue 1 November 1951https://pubs.acs.org/d…
``CHEMICAL'' ANALYSIS OF THE INTACT SKIN BY REFLECTANCE SPECTROPHOTOMETRY
IT HAS been said repeatedly that one of the greatest obstacles to progress in dermatology is the lack of practical, quantitative methods for investigation of the skin. It is true, of course, that a number of good functional tests exist: measurement of sweating, sweat sodium, and lipid secretion, for example, is possib…
Addition of Hydrazoic Acid to Conjugated Systems1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAddition of Hydrazoic Acid to Conjugated Systems1J. H. BoyerCite this: J. Am. Chem. Soc. 1951, 73, 11, 5248–5252Publication Date (Print):November 1, 1951Publication History Published online1 May 2002Published inissue 1 November 1951https://pubs.acs.org/doi/10.1021/ja01155a07…
Sodium and Potassium Tungsten Bronzes1,1a
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSodium and Potassium Tungsten Bronzes1,1aE. O. Brimm, J. C. Brantley, J. H. Lorenz, and M. H. JellinekCite this: J. Am. Chem. Soc. 1951, 73, 11, 5427–5432Publication Date (Print):November 1, 1951Publication History Published online1 May 2002Published inissue 1 November 1951h…
Reaction of Vaporized Sodium Sulfate with Aluminous Refractories
A method was devised and tested whereby the action of an alkali salt, in the vapor or in the liquid state, on refractory materials may be studied under controlled conditions of temperature and pressure. Using Na 2 SO 4 , the progress of reaction was followed by (1) change of weight, (2) determination of SO 3 by precip…
Anelasticity of Glass: II, Internal Friction and Sodium Ion Diffusion in Tank Plate Glass, A Typical Soda‐Lime‐Silica Glass
The internal‐friction peak observed near room temperature in tank plate glass at a period of the order of seconds and previously attributed to sodium ion diffusion is further discussed. The temperature of maximum internal friction is shown to vary with the frequency of vibration with an activation energy of about 16 k…
Phosphates of Niobium and Tantalum1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhosphates of Niobium and Tantalum1Richard B. HahnCite this: J. Am. Chem. Soc. 1951, 73, 11, 5091–5093Publication Date (Print):November 1, 1951Publication History Published online1 May 2002Published inissue 1 November 1951https://pubs.acs.org/doi/10.1021/ja01155a022https://d…
Eiskeimbildung durch dielektrische Polarisation
Abstract In unterkühlten Wassertropfen kann die Eiskeimbildung durch ein elektrisches Feld in streng reproduzierbarer Weise hervorgerufen werden. Passende Elektrodenanordnungen (Funke im Luftraum auf die Tropfen bzw. Spitzenwirkung, Elektroden mit Bernsteinhülle, Kondensatoren und Funken in den Wassertropfen selbst) l…
Magnetic Susceptibility of Manganese Selenide
The susceptibility-temperature relation for the antiferromagnetic compound MnSe was measured over a range of temperatures between 70\ifmmode^\circ\else\textdegree\fi{}C and -196\ifmmode^\circ\else\textdegree\fi{}C. Evidence was found of a large thermal hysteresis and a dependence of susceptibility on field strength. A…
Ferromagnetic Resonance and the Internal Field in Ferromagnetic Materials
A classical treatment of the domain energy terms of a homogeneous ferromagnetic solid leads to a formula for the internal field contributions from these terms. With this result, modifications in the resonance condition of ferromagnetic resonance arising from self energy, exchange energy, magnetocrystalline anisotropy,…
Color and Constitution. X. 1 Absorption of the Merocyanines 2
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColor and Constitution. X.1 Absorption of the Merocyanines2L. G. S. Brooker, G. H. Keyes, R. H. Sprague, R. H. VanDyke, E. VanLare, G. VanZandt, F. L. White, H. W. J. Cressman, and S. G. Dent Jr.Cite this: J. Am. Chem. Soc. 1951, 73, 11, 5332–5350Publication Date (Print):Nov…