Materials Literature
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The design and construction of a double focusing uniform field magnetic electron spectrometer are described. The pole pieces of the magnet are curved in an effort to correct all median plane aberrations and thereby increase the collecting power. The spectrometer has been installed on a scanning microscope which uses a…
ATTACKING aircraft in the first world war used to fly in low, drop their bombs by hand over the cockpit side and be considered unlucky if a rifle bullet came anywhere near them.
The rare occurrence of inactive catalyst gauzes for no obvious reason has led to comparative studies of the structures of rhodium-platinum wires from both active and inactive gauzes. Active gauzes showed the regular development of octagonal crystal faces on the nodular growths on the wires. Inactive gauzes showed no c…
Fiber optics for telecommunications applications require very high purity glass. Light loss in glass results primarily from absorption and scattering. Transition metal ions and OH ions cause most of the absorption, whereas scattering is caused by microheterogeneity. Scattering losses vary from 1 to 4 dB/km at 850 nm;…
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…