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and allowing for the correlations between bond lengths, the e.s.d's of the mean bond lengths are 0.0028 A for naphthalene and 0.0021 /~ for anthracene. The difference of the means is possibly significant for naphthalene, but, even if the theoretical mean is readjusted, it is still necessary to postulate theoretical er…
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A kinetic study and analysis has been made of the effects of ionic strength, acid activity, temperature, and salt type on the dissolution of magnesium in acidic salt solutions. This is an example of the simplest type of corrosion involving hydrogen evolution. The results are interpreted in terms of the effects of the…
A process is described in which radioactive radiation traverses a solid dielectric medium to charge a collector electrode. This process offers a simple method of studying effects of radiation on matter such as bombardment-induced conductivity, secondary emission, charge soakage, and radiation absorption. Typical data…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Surface Chemistry of Bone. VII. The Hydration Shell1W. F. Neuman, T. Y. Toribara, and B. J. MulryanCite this: J. Am. Chem. Soc. 1953, 75, 17, 4239–4242Publication Date (Print):September 1, 1953Publication History Published online1 May 2002Published inissue 1 September 19…
Single crystals of copper were deformed at 78\ifmmode^\circ\else\textdegree\fi{}K and 300\ifmmode^\circ\else\textdegree\fi{}K. There was slight temperature dependence of the critical shear stress in this range of temperature and for shear strains less than about 0.25 the stress-strain relationship was linear and indep…
This paper presents rf index-of-refraction data for metallic delay-lens media containing square and circular obstacles. The equipment used in measuring this data is described, and the necessary correction formulas are given. The test specimens consisted of alternate layers of polyfoam spacers and thin polystyrene shee…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Identification of Dipropylene Glycol IsomersA. R. Sexton and E. C. BrittonCite this: J. Am. Chem. Soc. 1953, 75, 17, 4357–4358Publication Date (Print):September 1, 1953Publication History Published online1 May 2002Published inissue 1 September 1953https://pubs.…
Electron microscopic evidence is presented in support of the hypothesis that black carbon resulting from pyrolysis of gaseous hydrocarbons is produced through the intermediate formation of droplets of complex hydrocarbons. Electron diffraction studies further confirm this hypothesis if, as has been found for particles…
The dielectric constant έ/ε0 and loss tangent tanδ of barium-strontium titanate ceramics were measured as a function of temperature and static electric field at frequencies of 10 kc, 500 kc, and 3000 Mc. No frequency dependence of έ/ε0 was apparent at temperatures above the Curie point. An increase in tanδ was observe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Stability of the Rare Earth Complexes with Ethylenediaminetetraacetic AcidE. J. Wheelwright, F. H. Spedding, and G. SchwarzenbachCite this: J. Am. Chem. Soc. 1953, 75, 17, 4196–4201Publication Date (Print):September 1, 1953Publication History Published online1 May 2002Pu…
Crystallization is viewed as a kinetic process, the relative "ease" of which is influenced by details of the structures involved. The word "simplexity" is used as a measure of structural complexity. In general, high "simplexity" is synonymous with disorder, or structural simplicity, or high entropy. Nucleation and gro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrolyses of the Salts of the Perfluoro Carboxylic Acids1J. D. LaZerte, L. J. Hals, T. S. Reid, and G. H. SmithCite this: J. Am. Chem. Soc. 1953, 75, 18, 4525–4528Publication Date (Print):September 1, 1953Publication History Published online1 May 2002Published inissue 1 Sept…
The resonance frequencies of a system containing two or four magnetic sublattices with different gyro-magnetic ratios are calculated. It is found that in many cases the results reduce to the standard formulas of ferromagnetic and antiferromagnetic resonance; they are stated, however, in terms of an effective gyromagne…
A general method is given, by which problems of elastic plane strain in a bimetallic medium can be reduced to standard problems of potential theory. A bimetallic medium is one where the elastic constants are different on either side of a plane. The boundary between the two semi-infinite solids can be either a complete…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond Energies and Polarities1Maurice L. HugginsCite this: J. Am. Chem. Soc. 1953, 75, 17, 4123–4126Publication Date (Print):September 1, 1953Publication History Published online1 May 2002Published inissue 1 September 1953https://pubs.acs.org/doi/10.1021/ja01113a001https://do…
It is shown that the unusual observed saturation behavior of the microwave electron spin resonance associated with $F$ centers in KCl, NaCl, and KBr crystals can be accounted for if the overall width is ascribed to interaction between the $F$-center electrons and the nuclear magnetic moments of the ions adjacent to th…
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