Luminescence in solids
R. W. Gurney and N. F. Mott, Trans. Faraday Soc., 1939, 35, 69 DOI: 10.1039/TF9393500069
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
64. The crystal structure of iron enneacarbonyl
The first page of this article is displayed as the abstract.
Further Tests of the Validity of X-Ray Crystal Methods of Determininge
The authors have continued their efforts to absolve the x-ray method of determining the electronic charge of the criticism that Bragg reflection determines the lattice dimensions in only a very shallow surface region whereas the density determinations have been made on a much larger volume of crystal. In earlier work…
The Mechanism of the Negative Point to Plane Corona Near Onset
Oscillographic studies have been made of the currents in negative point to plane coronas in air. The oscillograms obtained indicate that the negative corona current is composed of discrete pulses whose magnitude and frequency have a definite relationship to the corona current, point size and gas pressure. The frequenc…
On certain simple peptides occurring in marine algae
described the isolation of water-soluble peptides from the brown alga Pelvetia canaliculata forma libera S. M. Baker and the red alga Corallina officinalis Lirn. It was then suggested that the presence of peptides in algae was due to a lack of metabolic balance determined either by desiccation or by low illumination.…
The Focusing of Charged Particles by a Spherical Condenser
The paths of charged particles traversing a portion of an ideal spherical condenser are worked out. The section of the condenser considered is bounded by two rays, enclosing an angle $\ensuremath{\Phi}$, from the common center of curvature, $O$, of the equipotential surfaces. It is shown that a group of particles, hom…
Hydrogen Bonds Involving the C-H Link. V. The Solubility of Methylene Chloride in Donor Solvents
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen Bonds Involving the C-H Link. V. The Solubility of Methylene Chloride in Donor SolventsM. J. Copley, G. F. Zellhoefer, and C. S. MarvelCite this: J. Am. Chem. Soc. 1938, 60, 11, 2714–2716Publication Date (Print):November 1, 1938Publication History Published online1…
X-Ray Analysis of the Structure of Water
X-ray diffraction patterns of water were obtained at five temperatures: 1.5°, 13°, 30°, 62°, and 83°C. The radiation was Cu Kα and Mo Kα, monochromated by reflection from a rocksalt crystal. Radial distribution curves for water at the five temperatures were obtained by a Fourier analysis of the x-ray intensity curves.…
The problem of the carbonate apatites; a carbonate oxy-apatite (dahllite)
Crystal structure analysis shows there can be no further doubt regarding the existence of the carbonate apatite or oxy-apatite molecules. Chemical analysis is given of the dahllite from Mouillac, France, upon which x-ray measurements were made.
The Diffusion of Helium and of Hydrogen Through Pyrex Chemically Resistant Glass
The effects of temperature and of heat treatment on Pyrex chemically resistant glass have been studied by measuring the rate of diffusion of helium and of hydrogen through a tube of about one millimeter wall thickness. Measurements were made with helium between 180°C and 590°C, and with hydrogen at 512°C. The influenc…
Heats of combustion of diamond and of graphite
Measurements were made of the heats of combustion of one artificial graphite, two natural graphites, and two samples of diamond. The bomb calorimeter used was calibrated electrically and by means of benzoic acid. The amount of reaction in each combustion experiment was determined from the mass of carbon dioxide formed…
X-Ray Diffraction of Substances under High Pressures
An apparatus is described which may be used for x-ray diffraction work on substances under pressures up to 5000 atmospheres. The compressive medium is helium gas. A small (2.5 cm radius) Debye-Scherrer type camera is used. The camera, complete with film and specimen, was placed inside the high pressure chamber. The x-…
On the atomic arrangement and variability of the members of the montmorillonite group (With Plate V.)
According to their atomic arrangement the minerals found in clays can be divided into the two-layer and the three-layer structures. The members of the first group have alternating silica and alumina layers, e.g. kaolinite; the members of the second group have one alumina (or magnesium or iron) layer between two silica…
Direct Determination of Crystal Structure from X-Ray Data
The empirical similarity in the behavior of scattering-factor curves for different atoms is used to replace the structure-factor formulae by an approximating system. This system is shown to lead to $m'\mathrm{th}$ degree algebraic equations, designated fundamental equations, whose coefficients are calculable in terms…
The paramagnetism of the ferromagnetic elements
Abstract The theory of paramagnetism, originally developed by Langevin (1905) and extended by Weiss (1907) to include ferromagnetics, led to expressions giving the variation of magnetization with temperature above and below the Curie point. These proved of great value in correlating experimental results, and the gener…
THE CHEMILUMINESCENCE OF THE CHLOROPHYLLS, AND OF SOME OTHER PORPHYRIN METAL COMPLEX SALTS
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHE CHEMILUMINESCENCE OF THE CHLOROPHYLLS, AND OF SOME OTHER PORPHYRIN METAL COMPLEX SALTSPaul RothemundCite this: J. Am. Chem. Soc. 1938, 60, 8, 2005Publication Date (Print):August 1, 1938Publication History Published online1 May 2002Published inissue 1 August 1938https://p…
The Molecular Structure of Arsenious Oxide, As4O6, Phosphorus Trioxide, P4O6, Phosphorus Pentoxide, P4O10, and Hexamethylenetetramine, (CH2)6N4, by Electron Diffraction
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Molecular Structure of Arsenious Oxide, As4O6, Phosphorus Trioxide, P4O6, Phosphorus Pentoxide, P4O10, and Hexamethylenetetramine, (CH2)6N4, by Electron DiffractionG. C. Hampson and A. J. StosickCite this: J. Am. Chem. Soc. 1938, 60, 8, 1814–1822Publication Date (Print):…
MEASUREMENT OF THE DIELECTRIC CONSTANT OF CELLULOSE
A method has been devised for the measurement of the dielectric constant of a material that cannot be made to completely fill a condenser. The following is the procedure adopted: Two completely miscible liquids are so chosen that the dielectric constant of the material under examination lies between the two values for…
X‐RAY DIFFRACTION STUDY OF SODA‐BORIC OXIDE GLASS *
A bstract X‐ray diffraction patterns have been made of three samples of soda‐boric oxide glass of the following molal compositions: 0.114 Na 2 O, 0.225 Na 2 O, and 0.333 Na 2 O. The patterns were made in an evacuated camera, using MoK α radiation monochromatic by reflection from rock salt. Radial distribution curves f…
Emission bands of SiCl2and SnCl2
The discharge through flowing vapour of SiCl 4 , SnCl 4 , and SnCl 2 shows a number of regions of selective continuous emission, and, intimately connected with them, several sets of new bands. These appear under conditions unfavourable for the production of the known bands of SiCl and SnCl respectively. They are broad…