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Now showing items 21-30 of 34
Identification and determination of arsenic compounds by chromatographic and mass spectrometric methods
(1983)
Arsenate, arsenite, methylarsonic acid and dimethylarsinic acid are arsenic compounds commonly found in the environment. An efficient method combining high performance liquid chromatography with a Hitachi-Zeeman graphite ...
The dehydrogenation of ethane over chromium catalysts
(1983)
The nature of the active sites for ethane dehydrogenation over chromium supported on silica gel and the effect of the support on the properties of chromium catalysts for the dehydrogenation of ethane were investigated. Low ...
CNDO/CI calculations using symmetry orbitals
(1983)
A new parameterization of the CNDO method is presented which correctly includes symmetry in the calculation. This new method is parameterized on the subshell level allowing each type of atomic orbital to be varied independently ...
Novel studies in x-ray emission analysis using radioisotopes
(1983)
Two novel techniques employing radioisotopes for x-ray emission were studied: internal x-ray emission analysis and low energy proton activation with counting of radioactive x-ray emitters. An inexpensive, sensitive technique ...
Photoelectron spectra and molecular orbital calculations of tricobalt alkylidyne and tri-cobalt, iron, ruthenium, and osmium sulfide nonacarbonyl and triosmium decacarbonyl clusters
(1983)
Ultraviolet photoelectron (PE) spectroscopy and molecular orbital (MO) calculations were performed on ((mu)(,3)-CR)Co(,3)(CO)(,9) (R = Cl,Br,I,H,Me,OMe), SCo(,3)(CO)(,9), SH(,n-1)Fe(,n)Co(,3-n)(CO)(,9) (n = 1,2,3), ...
Development and applications of multidimensional fluorescence spectroscopy in time-dependent systems
(1983)
Fluorescence detection has been important in the analysis of time-dependent processes due to the high sensitivity and rapid response of the technique. However, the acquired data only provide information about the kinetic ...
Studies of MCSCF optimization and application to many-body techniques for the electronic states of atoms and molecules
(1983)
We develop and review multiconfigurational self-consistent field (MCSCF) procedures based on unitary exponential operators. When the energy functional is expanded through second order in the orbital and state optimization ...
Multinuclear NMR studies of methylsilver [I], -copper [I], and -mercury [II] complexes
(1983)
Characterization of methyl(tri-n-butylphosphine)silver{I} (1), lithium{dimethyl(tri-n-butylphosphine)silver{I}} (2), and dilithium{trimethyl(tri-n-butylphosphine)silver{I}} (3) by ('1)H, ('7)Li, ('13)C, and ('31)P NMR ...
Polymer-induced catalyst activity modification
(1983)
Insoluble polymers were shown to be capable of modifying catalyst activity when used as a support either for a transition metal catalyst or a ligand absorbing reagent. Polymer-bound Cp(,2)TiCl(,2) reduced by Grignard ...
Thermodynamic investigation of small homonuclear and heteronuclear molecules containing silicon and germanium
(1983)
The equilibrium involving gaseous species above the condensed systems Y/Ge, Y/Si, Sc/Ge, Sc/Si, Pd/Ge and Ni/Ge have been experimentally investigated at elevated temperatures by means of the high temperature mass spectrometric ...