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The 3-tube symmetrical electrostatic unipotential lens was analyzed in great detail. Starting from a mathematical expression for the axial potential distribution, the cardinal points and coefficients of spherical and chromatic aberration were obtained with the help of a digital computer. Values for S/R, the separation…
The ignition temperature of ten common non-toxic metals has been determined experimentally in an oxygen environment. In this investigation a induction furnace facility that emphasized the pre-ignition surface oxidation effects upon the ignition temperature was used. The bulk ignition temperatures of barium, bismuth, c…
ZnIn2S4 single crystals, grown from the vapor phase by iodine transport, display interesting current-voltage characteristics at high electric fields. Some crystals under illumination show an n-type negative-resistance effect. However, in other crystals which do not show such an effect, current oscillations occur whose…
Diffraction studies of samples of Vitromet, small glass spheres with a metallic coating, show that the surface deposit consists of very small crystallites (~100 Å) in which the internal stress is of the same order of magnitude as the ultimate tensile value. Using rapid methods of data collection and approximate proced…
A sequence of total energy distribution curves for field emission was experimentally obtained for a tungsten emitter heated to 1570 K. Theoretical curves using the Miller-Good WKB-type approximation for tunneling probabilities are in good agreement with the experimental measurements. A significant feature of both sets…
The Raman spectrum of an oriented single crystal of CaSO 4∙ 2H 2 O has been recorded from 20 to 3600 cm −1 at 300 °K and 77 °K using polarized laser excitation. The symmetries of the observed Raman lines have been determined and the spectrum has been analyzed in terms of external lattice vibrations, internal vibration…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of Ba2MnSe3. Linear antiferromagnetism in Ba2MnX3 (X = S,Se)Hugo Steinfink and I. E. GreyCite this: Inorg. Chem. 1971, 10, 4, 691–696Publication Date (Print):April 1, 1971Publication History Published online1 May 2002Published inissue 1 April 1971https://do…
The omega phase in as-quenched and aged Ti-V alloys was examined using high-resolution dark-field microscopy and selected-area diffraction. The asquenched omega morphology was shown to be based upon 〈111〉β‖〈0001〉ω rows containing particles which are 10-22 Å in diameter with an interparticle spacing of 20-25 Å. Cluster…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical studies of tetraphenylporphin, tetraphenylchlorin, and tetraphenylbacteriochlorinGeorge S. Wilson and Gerald. Peychal-HeilingCite this: Anal. Chem. 1971, 43, 4, 550–556Publication Date (Print):April 1, 1971Publication History Published online1 May 2002Publish…
Recent electron (ESCA) and x-ray emission and absorption spectra for the cubic refractory carbides of Group IVb (TiC, ZrC, HfC) and Group Vb (VC, NbC, TaC) are summarized. Based on an interpretation of the experimental data by using self-consistent-field calculations on free atoms and ions and supported by an approxim…
Special techniques of metallurgical microscopy are reviewed. The mathematical presentation is kept to a minimum. The emphasis is on technique, showing how various physical factors affect the situation being considered. Illustrated with numerous photomicrographs and diagrams. The author is with C.S. 1.R.O., Melbourne,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass transition in amorphous water. Application of the measurements to problems arising in cryobiologyDon H. Rasmussen and Alan P. MacKenzieCite this: J. Phys. Chem. 1971, 75, 7, 967–973Publication Date (Print):April 1, 1971Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of high polymersJohn. Mitchell and Jen. ChiuCite this: Anal. Chem. 1971, 43, 5, 267–334Publication Date (Print):April 1, 1971Publication History Published online1 May 2002Published inissue 1 April 1971https://pubs.acs.org/doi/10.1021/ac60300a021https://doi.org/10.10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared spectra of ground graphiteRobert A. Friedel and Gerald L. CarlsonCite this: J. Phys. Chem. 1971, 75, 8, 1149–1151Publication Date (Print):April 1, 1971Publication History Published online1 May 2002Published inissue 1 April 1971https://pubs.acs.org/doi/10.1021/j10067…
Abstract There are four Debye equations for dilute solutions which can be used to determine the relaxation time of a polar solute molecule. This paper offers a critical examination of these equations, especially two representative formulas which are mutually independent. If the solute molecule has a non-rigid configur…
Selective light reflection at the plane structure of a cholesteric liquid crystal is treated by the theory of de Vries(1) for normal incidence only. A more general approach is outlined for arbitrary angles of incidence. Conditions for the borders of the reflection bands are given. Also the cases of ordinary total refl…
Beta-gadolinium molybdate, β-Gd2(MoO4)3, is ferroelectric and ferroelastic with a Curie temperature of about 160°C and is paramagnetic with a moment of 7.98 μB. β-Gd2(MoO4)3 crystallizes in the orthorhombic system with space group Pba2 and four formulas in the unit cell. The lattice constants at 298°K are a = 10.38582…
When electron-lifetime effects, electron-hole pair excitations, or both are included in the description of an electron gas, the frequency associated with the surface plasmon is a complex quantity, the imaginary part providing a measure of the damping of the plasmon. The surface-plasmon dispersion relation then involve…
Abstract Dynamic mechanical and dielectric properties of various kinds of polystyrene, including bulk‐polymerized, monodisperse, isotactic, and thermally degraded samples, have been measured below the glass temperature to 4°K. Five relaxation processes are found, designated β, γ, γ′, δ, and ε in order of descending te…
Complete, three-dimensional crystal structure studies, including site-occupancy refinement, of a high-iron epidote, allanite, and hancockite have yielded cation distributions Cal. ooCal.oo(Alo. 93F eo.05) Ah. 00(Alo.24F eo.76) Si30'3H for epidote, Ca,. oo(REo.74Ca0.26) (Alo...FeO.34)Ah.oo(Alo.17Feo. 83) ShO'3H for all…