Magnetic circular dichroism spectra of the methyl halides. Resolution of the n → σ* continuum

The MCD (magnetic circular dichroism) of CH₃l, CH₃Br and CH₃Cl has been studied in the spectral region of the n → σ^* continuum (3500-1700 Å). The MCD spectrum of CH₃I makes it possible to resolve the three excited states contributing to the continuum. The peak energies and the oscillator strengths of the components are obtained.     

The geometric SO(3) × D model

The geometric SO(3) × D model is formulated as a computationally viable submodel of the algebraic sp(3, R) model containing the Sp (1, R) model of Arickx et al. as a submodel. It is basically a scheme for constructing a space of states (like the space of Slater determinants) which can be employed either directly, for constrained variational quantal dynamics of the Hartree-Fock, RPA and TDHF type, or to construct a shell-model basis for the diagonalization of a microscopic hamiltonian. The results of HF calculations, restricted to SO(3) × D surfaces, are reported for the nuclei ⁴He, ⁸Be, ¹⁶O and ²⁰Ne.     

Spectroscopic and structural studies of some oxocarbon condensation products: IV. a spectroscopic and mass spectral investigation of some derivatives of squaric acid

Proton-NMR, vibrational and mass spectral data are reported for nine molecules derived from. squaric acid. The data substantiate the cyclobuta[b]quinoxaline structure for six of the molecules whereas the others are shown to be simple derivatives of squaric acid.     

Direct determination of the anharmonic vibrational potential for H in Pd

The vibration spectra of and -phase PdH(D)_x have been measured by neutron inelastic scattering. From a detailed analysis of the spectra, we conclude that the potentials for hydrogen and deuterium are very similar and strongly anharmonic. The results show definitively that anharmonicity is the principal contribution to the anomalous isotope dependence of the superconducting transition temperature in PdH(D).     

Application of epithermal neutron activation in multielement analysis of silicate rocks employing both coaxial Ge(Li) and low energy photon detector systems

The instrumental activation analysis of silicate rocks using epithermal neutrons has been studied using both high resolution coaxial Ge(Li) detectors and low energy photon detectors, and applied to the determination of 23 elements in eight new U.S.G.S. standard rocks. The analytical use X-ray peaks associated with electron capture or internal conversion processes has been evaluated. Of 28 elements which can be considered to be determinable by instrumental means, the epithermal activation approach is capable of giving improved sensitivity and precision in 16 cases, over the normal INAA procedure. In eleven cases the use of the low energy photon detector is thought to show advantages over convertional coaxial Ge(Li) spectroscopy.