Materials Literature
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The multislice formulation of Cowley and Moodie for high-energy electron scattering is rederived from the Schrödinger equation, and the validity of the finite slice approach in practical computation is theoretically proved by the stationary-phase approximation. A set of computer programs for the multislice method is d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Study of Equilibrium Melting of PolyethyleneBernhard Wunderlich and George CzornyjCite this: Macromolecules 1977, 10, 5, 906–913Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Published inissue 1 September 1977https://pubs.acs.org/do…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectroscopic studies of iron oxidesN. S. McIntyre and D. G. ZetarukCite this: Anal. Chem. 1977, 49, 11, 1521–1529Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Published inissue 1 September 1977https://doi.org/10.…
The present state of research in the field of the natural polysaccharide chitin and chitosan is described. The bibliography includes 225 references.
The origin of thermoluminescence in dysprosium doped CaSO 4 phosphor has been attributed to the reduction of RE 3+ to RE 2+ by the capture of an electron in the irradiation process and its reconversion back to RE 3+ in the heating process of the thermoluminescence, the reconversion being due to a thermally released ho…
The defects are observed in the optical spectrum of irradiated diamond. TR12 has many very sharp phonon replicas in absorption, but fewer in photoluminescence. During electron irradiation at room temperature the defect is produced initially as the cube of the dose. It can be induced only in type II diamonds, and is pr…
The numerous layers of these strong collagen fibers, closely bound together by cross-over collagen fibrils joining the different layers, is believed to serve at least in part a mechanically protective function and possibly as a firm anchorage for the body musculature. Single layers of the more superficial collagen fib…
A theoretically based proposal of a concrete physical realization of a Lifshitz point is given for the first time. This point should occur on the $\mathcal{H}\ensuremath{-}T$ diagram of a chiral liquid crystal exhibiting a second-order transition between the smectic phases $A$ and helicoidal $C$ ($\mathcal{H}$ is a ma…
Salicylic acid forms a 1:1 complex with boric acid, the reaction involving both the fully protonated ligand, and the salicylate ion. The kinetics of this reaction have been studied by the stopped-flow method. The stability constant for the reaction involving salicylate ion has been calculated from measurements of the…
We have measured the Raman spectra of AgBr and AgCl in both the high-temperature solid and the melt. The melt spectra are strikingly similar to the spectrum of the superionic conductor $\ensuremath{\alpha}\ensuremath{-}\mathrm{AgI}$. We have found that second-order Raman scattering from short-wavelength vibrations ("z…
Raman measurements are reported in the superionic conductor AgI far below and above the transition temperature ${T}_{c}=147$\ifmmode^\circ\else\textdegree\fi{}C. At ${T}_{c}$, the crystal structure changes from the low-temperature wurtzite phase to a disordered-defect body-centered cubic structure ($\ensuremath{\alpha…
The second- and third-order hyperpolarizabilities of various mono- and meta-disubstituted benzene derivatives have been measured in the liquid state by simultaneous use of static-field induced second-harmonic generation and tunable four-wave mixing. For the vector part of the second-order optical nonlinearity comparis…
First- and second-order Raman-scattering measurements have been performed in the crystalline ${\mathrm{Ge}}_{1\ensuremath{-}x}{\mathrm{Si}}_{x}$ alloy series from low frequencies (\ensuremath{\sim} 40 ${\mathrm{cm}}^{\ensuremath{-}1}$) to high frequencies (\ensuremath{\sim} 1100 ${\mathrm{cm}}^{\ensuremath{-}1}$). The…
The interaction of electrons with librational modes is proposed as the basic mechanism responsible for the observed temperature behavior of the resistivity in tetrathiafulvalene-tetracyanoquinodimethane. This mechanism also gives a reasonable estimate of the relaxation time.
X-ray diffuse-scattering studies on tetrathiafulvalene-tetracyanoquinodimethane (TTF-TCNQ) above the 54-K phase transitions reveal two types of one-dimensional scattering at the wave vector $0.295{b}^{*}$ (earlier assigned to the $2{k}_{F}$ wave vector) and at $0.59{b}^{*}$ (corresponding to twice the former wave vect…
The cascade in the secondary-electron emission from atomically clean and atomically characterized surfaces of metals has been studied in the energy region of shortest inelastic mean free paths ($10 \mathrm{eV}\ensuremath{\lesssim}E\ensuremath{\lesssim}1000 \mathrm{eV}$). Specimen surfaces were cleaned in situ and char…
The dependence of the electron intersubband resonance on temperature has been studied between 4.2 and 130 K for photon energies 10.45, 15.81, and 44.32 meV. At the highest energy, distinct transitions from the ground state to each of the next three higher-lying levels (i.e., the 0\ensuremath{\rightarrow}1, 0\ensuremat…
The zone-center optical phonons of layer materials GaSe, GaTe, and their solid solutions are studied by means of Raman scattering. Most of the structure in the hitherto unstudied spectrum of GaTe is identified by following their evolution in the solid solutions and relating them to already known bands in GaSe. Increas…
The dc conductivities of seven concentrated aqueous acids, and the electrical relaxation properties of four of these, are reported. At the glass transition temperature Tg, as determined by differential thermal analysis, the dc conductivities increase with Tg for the individual acids, according to an Arrhenius function…
Abstract Measurements have been made of the viscoelastic properties of a range of low-molecular-mass polystyrenes each having a narrow molecular mass distribution. Several experimental techniques using alternating shear have been employed covering the frequency range 10-2 Hz to 450 MHz and at temperatures from the gla…