Now showing items 21-30 of 252
A pseudopotential SCF-MO study of Te 4 2+
(John Wiley & Sons, Inc., 1980)
A recently developed ab initio pseudopotential molecular orbital approach was applied to the Te 4 2+ ion, a system outside the practical reach of conventional all-electron treatments. Computations were carried out ...
An improved electron diffraction--microwave and molecular orbital study of the structure of SF5Cl
(Elsevier, 1981-09)
A new study of the structure of SF5Cl is reported. Previously-obtained electron diffraction data have been corrected for multiple scattering, and newly-reported microwave rotational constants have been combined in the ...
Ultraviolet-visible diode-array spectrophotometer as a detector for gas chromatography
(Elsevier, 1985-05-01)
An ultraviolet-visible diode-array spectrophotometer is used as a detector for gas chromatography. This detector can provide a full u.v.-visible spectrum of each compound as it elutes from the column, thus enhancing ...
A convenient synthesis of substituted [gamma]-pyrones
(Elsevier, 1980)
An efficient and general synthetic method for various 2-mono- and 2,6-disubstituted [gamma]-pyrones has been developed. This utilizes the -acylation (70-85%) of [beta]-methoxy-[alpha],[beta]-enone lithium enolates by acid ...
Exciton transport in naphthalene alloys: A transition from percolation to diffusion
(Elsevier, 1982-12-03)
Steady-state singlet excitation transport in ternary naphthalene crystals (C10H8/C10D8/[beta]-methylnaphthalene) fits diffusion models at 4.2 K, but not at 1.8 K, where it fits a percolation model.
Supercritical fluid jet expansions of polar aromatic carboxylic acids using simple derivatization with detection by resonant two-photon ionization
(Elsevier, 1988)
In this work simple derivatization is used as a means of enhancing the solubility of polar aromatic carboxylic acids in supercritical CO2 and N2O. The supercritical fluid is then expanded from 200 atm and 40[deg]C through ...
An optically detected magnetic resonance study of Mn4+ in Cs2GeF6 and K2GeF6
(Elsevier, 1988-11-15)
The photoexcitation and photoluminescence spectra (2E 4A2) of MnF62- diluted in Cs2GeF6 and K2GeF6 host lattices have been recorded at liquid helium temperature. The manganese coordination geometry is Oh in Cs2GeF6 and ...
Electron diffraction studies of hot molecules. I. Observed and calculated thermal expansions of SF6, CF4, and SiF4
(The American Institute of Physics, 1982-08-15)
A new method is described for the rapid heating (10−5–10−6 s) of gas molecules for study by electron diffraction. Laser irradiation of the tip of a micronozzle makes it possible to determine structures, amplitudes of ...
Photoluminescence studies of layered transition metal phosphorus chalcogenides and their pyridine intercalation compounds
(Elsevier, 1986-06)
Ultraviolet photoexcitation of Cd2P2S6 and Zn2P2S6 single crystals produces a characteristic photoluminescence between 2.5 and 1.5 eV. Mn2P2S6 exhibits only low energy emission due to transitions between localized d-orbital ...
Rotational analysis of the red electronic emission spectrum of molybdenum nitride (MoN)
(Elsevier, 1985-04)
A system of emission bands in the red region of the optical spectrum has been identified as due to the species MoN. The system was generated by the microwave (2450 MHz) excitation of a flowing mixture of MoCl5 and molecular ...