Now showing items 131-140 of 140
Vibrational exciton cluster states, percolation and pairwise interactions: Benzene A2u band
(Elsevier, 1978-04-01)
Infrared spectra of isotopic mixed benzene crystals (C6H6/C6D6) were obtained at about boiling nitrogen temperature, with, emphasis on the umbrella mode (at about 700 cm-1). These are interpreted in terms of guest cluster ...
Neutron scattering study of the phase transitions in a doped polycrystalline Fe3O4: Zn0.005Fe2.995O4
(Elsevier, 1977-02)
Temperature dependent neutron elastic scattering and resistivity measurements have been made on a polycrystalline sample of Zn0.005Fe2.995O4, which displayed a well-separated, bifurcated, heat-capacity anomaly. The ...
Error matrices in gas-electron diffraction : II. Influence of weight matrix
(Elsevier, 1973-08)
The properties of three different forms of error matrices in electron diffraction are investigated, assuming the presence of stationary, Gaussian, Markovian noise in the primary data. The error matrices studied are Mxp ...
Evidence for two sites of inhibition of photosynthetic electron transport by dibromothymoquinone
(Elsevier, 1978-08)
Two sites in the photosynthetic electron transport chain of spinach chloroplasts are sensitive to inhibition by the plastoquinone antagonist dibromothymoquinone (2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone). This ...
Exciton percolation I. Migration dynamics
(The American Institute of Physics, 1976-10-01)
The exciton transfer, via migration and trapping, in binary and ternary mixed crystals is formulated in terms of percolation theory and the cluster structure for binary randomly mixed crystals. An important limiting case ...
External, internal and semi-internal vibrations in molecular solids: spectroscopic criteria for identification
(Elsevier, 1973-09-01)
A new method to identify the nature of vibrations in molecular crystals as external or internal is proposed. The criterion is that in isotropic mixed crystals of protonated and corresponding perdeuterated compounds, the ...
Thermo-optical spectroscopy of low temperature solids
(Elsevier, 1977-07-01)
A discussion of an experimental procedure for determining the absorption spectra of low temperature solids by thermo-optical spectroscopy is presented. The method may be extended to the direct measurement in low temperature ...
Finite nucleus model for the Fermi contact interaction
(John Wiley & Sons, Inc., 1979-01)
A model for the Fermi contact interaction is proposed in which the charge and magnetic moment of the nucleus are uniformly distributed within a sphere of radius r 0 . This leads to a SchrÖdinger equation, which is solvable ...
Steady-state kinetic analyses of Photosystem II activity catalyzed by lipophilic electron acceptors
(Elsevier, 1979-08-14)
Steady-state kinetic analyses of the Photosystem II activity elicited by quinones and quinonediimines in KCN/Hg-inhibited chloroplasts reveal that: 1. 1. Quinones generate a single reaction in which one quinone competes ...