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High-energy radiation simultaneously produces vacancies and interstitials in crystalline materials and, therefore, both types of defects are supersaturated during irradiation. The nucleation of defect precipitates under this circumstance is fundamentally different from the usual nucleation problem because of the compe…
CaSO4:Tm and CaSO4:Dy were found to be free from the serious disadvantage of rapid fading in CaSO4:Mn and yet retain the outstanding property of high sensitivity of CaSO4:Mn, the most sensitive thermoluminescence dosimeter available at present. Glow curves of both CaSO4:Dy and CaSO4:Tm are rather simple showing a main…
The crystal structures of CaMoO4, SrMoO4, SrWO4, and BaWO4 have been refined from neutron diffraction data taken in the (h0l) and (hhl) zones. Oxygen position refinement is started from the parameters proposed by Sillén and Nylander and results in an improvement of over an order of magnitude in the oxygen coordinates.…
Theory for the Urbach-Martienssen (U-M) rule on the low energy tail of the fundamental absorption edge of insulators is proposed. The exciton propagator solved for an adiabatic lattice is averaged for lattice vibrations at finite temperature, and the self-energy of exciton is obtained. It describes two characters of e…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhysical and chemical properties of singlet molecular oxygenDavid R. KearnsCite this: Chem. Rev. 1971, 71, 4, 395–427Publication Date (Print):August 1, 1971Publication History Published online1 May 2002Published inissue 1 August 1971https://pubs.acs.org/doi/10.1021/cr60272a0…
"Nuclear Reactor Theory." Nuclear Science and Engineering, 45(2), pp. 234–235
The temperature dependence of the attenuation of longitudinal hypersonic waves at 9.4 GHz has been measured in 'perfect' specimens of trigonal crystals: quartz, lithium niobate and corundum. It is found that this attenuation follows a T 6.5 -law in the range 0.1<or= alpha (db/cm)<or=5. The results are in good qualitat…
Detailed assignments are given for normal modes of vibration in vitreous silica, germania and beryllium fluoride. They have been obtained by calculating the atomic displacement eigenvectors for selected modes throughout the spectrum, and separating the kinetic energy of these modes into contributions from cation motio…
Abstract The growth kinetics of single crystal lamellae grown from polyisoprene melts have been determined by thin film electron microscopy which also reveals the relevant microstructure. The growth rate of a continuous lamellar crystal is independent of the length of the crystal and (in the absence of crosslinks) dep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the nature of the metal-binding sites and estimate of the distance between the metal-binding sites in transferrin using trivalent lanthanide ions as fluorescent probesChun Ka LukCite this: Biochemistry 1971, 10, 15, 2838–2843Publication Date (Print):July 20, 1971Pub…
The wavelength-modulated absorption and reflection spectra of SrTi${\mathrm{O}}_{3}$ have been measured as functions of temperature. Over a 60-K temperature range around the structural phase transition the band gaps of both high- and low-temperature phases are observed simultaneously. This effect and an associated ban…
The mechanism of deformation of the ordered CuAu alloy is investigated using electron microscopy. The alloy deformation is shown to be accomplished by slipping; a larger degree of deformation involves the mechanism of twinning. The interaction between dislocations and the boundaries of 90° -disoriented domains has bee…
The influence of the partial substitution of Cr for Fe in BaFe12O19 on the intrinsic coercive force has been investigated. The specimens BaFe12−xCrxO19 (x = 0 to 3.0) were prepared by the ordinary powder method. The intrinsic coercive force iHc, saturation magnetization Is, and anisotropy constant K, at room temperatu…
The dielectric constants of NaClNaBr, KClKBr, RbClRbBr, KClRbCl, and KIRbI mixed ionic crystals were measured by the “immersion method” at 1 MHz as a function of concentration. Their variations with the mole fraction were represented by convex curves. A semi-empirical equation for calculating the dielectric const…
Photoelectron energy-distribution curves of Pt at photon energies $6.8\ensuremath{\le}\ensuremath{\hbar}\ensuremath{\omega}\ensuremath{\le}11.6$ eV exhibit structure originating from initial states 3.6, 2.5, 1.5, and between 0.7 and 0.2 eV below ${E}_{F}$. A strong peak at - 0.2 eV observed for $\ensuremath{\hbar}\ens…
The photodissociation of N2O involving electronically excited metastable fragments has been investigated at wavelengths ≳ 1050 Å by photofragment translational energy spectroscopy. Irradiation was carried out with light pulses of a few microseconds duration, and fragment energies were measured by means of the time-of-…
This paper reports determinations of collisional deactivation rate constants for O2(1Δg) by minor atmospheric constituents and other gases. The benzene–oxygen photochemical system was used to produce O2(1Δg), and relative concentrations were measured by monitoring the intensity of its emission at 1.27 μ. The rate cons…
The Raman spectra of single crystal KClO3 were measured in the region above 30 cm−1 at 298 and 77°K. Single crystal infrared spectra in the internal mode region were measured by reflection at 298°K. Infrared spectra of the polycrystalline material also were measured at 77°K. Assignments for all of the crystal vibratio…
The characteristics of cation diffusion and ionic conductivity in solid electrolytes are discussed using β- and β″-alumina as examples. The problem is characterized by a cation migration by the vacancy mechanism in a “cation-disordered phase,” a system in which the number of available vacant sites is of the same order…
In this paper we derive from first principles, equations describing the kinetics of luminescent transfer. We apply the Pauli equation to an appropriately defined density matrix to derive, under one formalism but under opposite limiting assumptions, both the usual nonlinear kinetic rate equations and the equations whic…