Nuclear Reactor Theory
"Nuclear Reactor Theory." Nuclear Science and Engineering, 45(2), pp. 234–235
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On the attenuation of 9.4 GHz longitudinal hypersonic waves in some trigonal crystals
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…
Normal mode assignments in vitreous silica, germania and beryllium fluoride
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…
Microkinetics of lamellar crystallization in a long chain polymer
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…
Study 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 probes
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…
Optical Absorption Edge of SrTiO3Around the 105-K Phase Transition
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…
Deformation of Ordered CuAu Alloy
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…
Intrinsic Coercivity of BaFe12−xCrxO19
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…
Dielectric Constant of Mixed Ionic Crystals
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…
Photoemission Studies of Platinum
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…
Time-of-Flight Spectroscopy of Metastable Photodissociation Fragments. N2O Dissociation in the Vacuum uv
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-…
Collisional Deactivation of O2(1Δg)
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…
Polarized Vibrational Spectra of Potassium Chlorate
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…
Cation Diffusion and Conductivity in Solid Electrolytes. I
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…
Role of Rate Equations in the Theory of Luminescent Energy Transfer
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…
Electrohydrodynamic and Dielectric Instabilities of Cholesteric Liquid Crystals
A model is proposed for electrohydrodynamic alignment effects in cholesteric liquid crystals. We derive and discuss a formula for the threshold voltage of such alignment, starting from the planar texture between two conducting plates. An improved formula for the threshold of the dielectric deformation of this orientat…
Electronic Core Levels of theIIB−VIACompounds
X-ray induced electron-emission measurements were used to determine the energy levels of core electrons in ZnO, ZnS, ZnSe, ZnTe, CdO, CdS, CdSe, CdTe, HgS, HgSe, and HgTe. The investigated energy range extends from the bottom of the valence band to about 1200 eV below the Fermi level. Chemical shifts were determined b…
Raman Spectra and Lattice Dynamics of Tellurium
The Raman spectrum of trigonal tellurium has been obtained at 295 and 90 \ifmmode^\circ\else\textdegree\fi{}K. The Raman-active ${A}_{1}$ singlet and two $E$ doublets are identified by the scattering polarization selection rules, and the $E$-mode LO-TO splittings and linear wave-vector shifts are observed. The natural…
Nonequilibrium Steady-State Statistics and Associated Effects for Insulators and Semiconductors Containing an Arbitrary Distribution of Traps
The statistics for an arbitrary distribution of traps under nonequilibrium steady-state conditions is derived, and it is seen to be identical in form to the Shockley-Read expression for a single trapping level. The energy dependence of the statistics has been investigated, and several interesting features have been de…
Dispersion of Surface Plasmons in InSp
Infrared-reflectivity measurements on InSb surfaces having inscribed line gratings yield the first complete dispersion relation for surface plasmons.Received 10 May 1971DOI:https://doi.org/10.1103/PhysRevLett.27.95©1971 American Physical Society