Bonding and Structures of Transition Metals
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Effective-Spin Hamiltonian for "Non-Kramers" Doublets
The use of a spin-\textonehalf{} formalism to analyze paramagnetic and paraelectric resonance experiments of "non-Kramers" doublets leads to a break with the accepted meaning of effective-spin Hamiltonians. The operators appearing in the Hamiltonian do not have the transformation properties of spin angular momentum in…
Zero-Field Splitting ofS-State Ions. III. Corrections to Parts I and II and Application to Distorted Cubic Crystals
The procedures developed in two previous papers by the authors for calculating the parameters $D$ and $E$ in the spin Hamiltonian ${\mathcal{H}}_{s}=D[3{{S}_{z}}^{2}\ensuremath{-}S(S+1)]+E({{S}_{x}}^{2}\ensuremath{-}{{S}_{y}}^{2})$ for iron-group $3{d}^{5}(^{6}S)$ ions are applied to a distorted cubic system, namely,…
Spin-Orbit-Coupling Effects in Transition-Metal Compounds
Crystal-field splittings in a high-symmetry phase may leave an orbitally degenerate ground state. Three types of degeneracies are considered: (1) a twofold degeneracy that carries no orbital angular momentum, (2) a twofold degeneracy that carries an orbital angular momentum, and (3) a threefold degeneracy that carries…
Radiative and Multiphonon Relaxation of Rare-Earth Ions inY2O3
Spontaneous-emission probabilities for electric- and magnetic-dipole transitions from excited electronic states of ${\mathrm{Pr}}^{3+}$, ${\mathrm{Nd}}^{3+}$, ${\mathrm{Eu}}^{3+}$, ${\mathrm{Er}}^{3+}$, and ${\mathrm{Tm}}^{3+}$ impurities in ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$ are calculated using eigenstates in inte…
rf-Induced Sidebands in Mössbauer Spectra
We report the first clear evidence that rf magnetic fields generate acoustical side-bands in the M\"ossbauer spectra of metallic ${\mathrm{Fe}}^{57}$. We advance an explanation of this magnetoacoustic effect in terms of magnetostriction, and suggest that this effect provides a consistent explanation of the results of…
Measurement of High-Energy Charge-Transfer Cross Sections for Incident Protons and Atomic Hydrogen in Various Gases
Measurements of electron-capture cross sections ${\ensuremath{\sigma}}_{10}$ and electron-loss cross sections ${\ensuremath{\sigma}}_{01}$ for protons and atomic hydrogen in ${\mathrm{H}}_{2}$, He, Ar, Kr, ${\mathrm{N}}_{2}$, ${\mathrm{O}}_{2}$, CO, C${\mathrm{O}}_{2}$, ${\mathrm{H}}_{2}$O, C${\mathrm{H}}_{4}$, ${\mat…
Rubber Chemicals from Cyclic Amines. III. Iminocarbodithioates as Accelerators and Curing Agents
Abstract Evaluations of cyclic iminocarbodithioates as accelerators and vulcanizing agents are described. The starting amines include morpholine and 3-azabicyclo-[3.2.2]nonane and vary in ring size from tetra- to octamethylenimine. The chemical structure of these compounds is correlated with their cure characteristics…
The Photolysis of Polyvinylpyrrolidone in Oxygen-Free Aqueous Solutions
The photolysis of polyvinylpyrrolidone in oxygen-free aqueous solutions has been investigated as a function of polymer concentration, chain length, light intensity, and temperature. Ultraviolet spectra at various degrees of degradation have been measured. The experimental data can be satisfactorily accounted for by a…
The polymerization and copolymerization of nitroalkyl acrylates and nitroalkyl methacrylates
Abstract Nitroalkyl acrylates and methacrylates involving some new compounds were prepared. The homopolymerization of these monomers in toluene and their copolymerization with styrene in acetone were carried out with azobisisobutyronitrile as initiator. The rate of polymerization of the nitroalkyl acrylates showed a c…
Surface Conductivity and Dielectrical Properties of Montmorillonite Gels
Abstract The surface conductivity of salt free montmorillonite clay gels saturated with lithium, sodium, potassium and cesium has been studied. The theory of the behavior of heterogeneous dielectrics adapted to systems having a surface charge density has been applied to the clay gels. From numerical calculations it be…
Stability of hectorite in weakly acidic solutions. I. A chemical study of the dissolution of hectorite with special reference to the release of silica
Abstract The dissolution of hectorite suspensions in M/20 CaCl 2 has been studied under conditions of low acidity. The reaction was almost completed within 2 weeks but very slow changes continued. There was an initial preferential release of Mg which corresponded approximately to the number of Mg atoms exposed at the…
Polyoxamides. 1. Preparation and Characterization of Cyclic Oxamides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxamides. 1. Preparation and Characterization of Cyclic OxamidesO. Vogl and A. C. KnightCite this: Macromolecules 1968, 1, 4, 311–315Publication Date (Print):July 1, 1968Publication History Published online1 May 2002Published inissue 1 July 1968https://pubs.acs.org/doi/1…
Rubber Chemicals from Cyclic Amines. II Dithioamines and Sulfenamides as Accelerators and Curing Agents
Abstract Dithioamines and sulfenamides derived from various cyclic amines were evaluated as accelerators and vulcanizing agents. Structural variations of these compounds are correlated with their scorch delaying properties, accelerating activity and vulcanization efficiency, employing the Mooney Viscometer and the Mon…
Oxidative Degradation of Nylon 66 Filaments
Drawn and undrawn nylon 66 filaments were exposed to oxygenated aqueous systems, and the extent of chemical degradation was studied as a function of time. Degradation was estimated by measuring the changes in both chemical and physical properties. At the same time, oxygen absorption measurements were made and these we…
Polyoxamides. II. Polymerization of Cyclic Diamides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxamides. II. Polymerization of Cyclic DiamidesO. Vogl and A. C. KnightCite this: Macromolecules 1968, 1, 4, 315–318Publication Date (Print):July 1, 1968Publication History Published online1 May 2002Published inissue 1 July 1968https://pubs.acs.org/doi/10.1021/ma60004a00…
Blends of cis-1,4-Polybutadiene with Natural or Styrene Butadiene Rubber
Abstract Temperature dependence of dielectric loss, mechancial loss, and dynamic modulus were measured to study polymer blending. Results were as follows: Dielectric loss and dynamic modulus of NR—BR blends showed two peaks corresponding to NR and BR, indicating that the blends were microheterogeneous. A single, broad…
ANALYSIS OF THERMAL STRESSES AND METAL MOVEMENT DURING WELDING
A literature survey on thermal stresses during welding and buckling after welding is described. From the analyses found, a computer program was developed to calculate thermal stresses and resulting residual stresses due to a moving heat source. This program is included in the appendix. Studies at Marshall Space Flight…
Vibrational Spectra and Thermodynamics of the Zinc Halides
The infrared absorption spectra of the four zinc halides have been investigated by the low-temperature matrix-isolation technique. The spectral range 800–35 cm−1 has been covered. Four absorption regions have been observed in all cases. The highest energy region is structured and represents the antisymmetric stretchin…
Input Admittance of a Circular Waveguide Aperture Covered by a Dielectric Slab
The input admittance of a circular waveguide opening onto an infinite flange with a homogeneous lossy dielectric coating is derived using integral transforms and assuming the dominant TE11mode as the trial field at the aperture. Admittance calculations for low-loss dielectric sheets of various thicknesses are given an…