Materials Literature
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The mechanical characteristics of triboluminescence (TL) from coumarin, acenaphthene, resorcinol, phenanthrene, and m-aminophenol crystals are studied. The TL spectra of these crystals resemble their fluorescence spectra. The TL appears concurrently with the sudden force decreases in the fracture regions of the force…
The systematics of the electronic structure of $\mathrm{La}B{\mathrm{O}}_{3}$ perovskite oxides, where the $B$ element scans the $3d$ transition-metal series from Ti to Co, are examined. X-ray photoelectron spectra of valence bands and shallow core states are presented and compared with theoretical molecular cluster a…
The surface-enhanced Raman spectrum of benzene and benzene-d6 adsorbed on a silver film vapor-deposited onto a low-temperature substrate is reported. Many lines which correlate with Raman-inactive and even infrared and Raman-silent modes of the free molecule are observed with high intensity in the spectrum. The local…
Intrinsic point defects were produced on ZnO ($10\overline{1}0$) surfaces by thermal treatment, uv illumination, and CO exposure. Electronic structure and thermodynamics of surface defects as well as their influence on charge-transfer reactions are discussed.
The temperature dependence of the radius of gyration of polystyrene (MW=2.6×107) in cyclohexane in the good through poor solvent regimes was obtained by analysis of the angular dependence of the autocorrelation function of light scattered from the solution. The observed transition in polymer dimensions through the coi…
Calculations of the pair-creation energy $\ensuremath{\epsilon}$, the Fano factor $F$, and the quantum yield for semiconductors are done for the assumptions that in each scattering event all possible sets of product particles are equally probable, that the energy bands are those of free particles separated by a band g…
A model for Raman scattering by a molecule adsorbed at the surface of a spherical particle is articulated by treating the molecule as a classical electric dipole. This follows Moskovits’s suggestion [ J. Chem. Phys.69, 4159 ( 1978)] and the experiments by Creighton [ J. Chem. Soc. Faraday Trans. II, 75, 790 ( 1979)] t…
A method is proposed for obtaining critical energies and angles for the scattering of electrons by atoms. The method requires phaseshifts only at three energies. The critical points have also been computed in the static-field approximation for the light atoms having atomic numbers 6 to 10. The values of the critical p…
Thermoluminescence of CaSO 4 :Dy has been investigated for radiations with widely different stopping powers. The lower stopping power radiations produce wide variations in the glow curve and a substantial increase in TL response. With increase in stopping power the extent of such variations reduces and the TL response…
For pt.I, see ibid., vol.12, p.3787 (1979). Total absolute cross section measurements are presented for electrons scattered by O 2 , N 2 and NO molecules. The energy range covered spans from 100 to 1600 eV. Neglecting the systematic error introduced by the finite angular resolution of the apparatus, the experimental a…
A theory of fracture transitions consistent with fracture mechanics is outlined. Transitions occur when a certain characteristic length attains a critical value: in linear elastic fracture mechanics this characteristic length is that of an inhomogeneous stress field, as for instance the radius of a notch. The critical…
X-irradiation of the phosphor material KiYF 4 at 4K results in a broad emission peaking at 300 nm. The magnetic circular dichroism of the emission has been studied at 1.6K and EPR has been detected optically. The EPR results are consistent with emission from the lowest triplet state of a number of self-trapped exciton…
A brief history of the many investigations of the pressure/temperature phase diagrams of elemental carbon is given. The strengths and weaknesses of the various proposed diagrams are discussed, and the areas where additional or better experimental data are needed are pointed out. Many questions still remain about linea…
Nuclear magnetic resonance and dielectric susceptibility data are reported in KTaO3: Li which show, for the first time, ordering of random-site electric dipoles in a nonpolar lattice.Received 29 September 1980DOI:https://doi.org/10.1103/PhysRevLett.45.1884©1980 American Physical Society
The rotational diffusion of rodlike $M\ensuremath{-}13$ viruses in solution has been measured at concentrations intermediate between the dilute and the concentrated regimes. The strong concentration dependence observed is in agreement with the Doi-Edwards model based upon simple steric hindrance arguments between rota…
The physical, structural, and mechanical properties of decrystallized cotton fibers prepared by preswelling in different concentrations of alkali followed by partial substitution—to nearly the same extent irrespective of the preswelling alkali concentration—by acetylation or cyanoethylation have been compared. The dec…
The experimental observations of the ferroelastic domain structure of CsPbCl3, in its monoclinic phase, are compared to the results obtained by a theoretical analysis using twinning by pseudo-symmetry, or a tensor method. The various kinds of observed domain walls are identified with the permissible W and S walls.
The effects of crosslinking upon the dynamic mechanical properties and swelling behavior of poly(acrylic acid) (PAA) have been studied. Materials were prepared by the free radical copolymerization of acrylic acid with varying amounts of the tetrafunctional monomer allyl acrylate (ALA). The results indicated a linear d…
The 153 Eu NMR and differential susceptibilities of EuSe 1- x S x with 0≤ x ≤0.3 have been measured as a function of temperature. The antiferromagnetic NNSS- type phase of EuSe is stabilized by substituting a small amount of sulfur ( x <0.1). The specimens with x ≥0.2 are ferromagnetic, and those with 0.1≤ x <0.2 are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR spectra of low-symmetry high-spin cobalt(II) complexes. 7. Trigonal-bipyramidal pentakis(picoline N-oxide)cobalt(II) perchlorateA. Bencini, C. Benelli, D. Gatteschi, and C. ZanchiniCite this: Inorg. Chem. 1980, 19, 12, 3839–3841Publication Date (Print):December 1, 1980Pu…