Materials Literature
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The absorption and fluorescence spectra of SmCl3 have been studied at 4°K and the Zeeman effects of many lines obtained in a magnetic field of 35 100 G. The lower group of levels obtained chiefly from the fluorescence spectrum can be unambiguously identified as the multiplet components of the 6H and 6F levels. The sit…
A new type of luminescence in nominally pure alkali halide crystals was studied. At room temperature the excitation was most efficient in the wavelength region that has been associated with band-to-band transitions. It is suggested that the emission results from the capture of a hole by an $F$ center. In agreement wit…
Fluorescence-polarization data on porphyrins are reported. The results can be readily interpreted in terms of the theory of polarization spectroscopy and the theory of the electronic and vibrational structure of these molecules. It is shown how these two theories combine to interpret most of the data, but some anomali…
The absorption spectra of thin films of argon, krypton, and xenon have been measured between 20 and 50\ifmmode^\circ\else\textdegree\fi{}K in the region from 1600 to 900 \AA{} (8 to 14 eV). The spectra show: (a) strong doublets corresponding to the atomic resonance doublets, (b) lines apparently of nonatomic nature, a…
Abstract Crystalline ‘spherulites’ grown in ultra-thin films of natural rubber at — 26 °C were examined in the electron microscope. The spherulites form hollow domes, like blisters in the film, which collapse under electron irradiation producing remarkable fibre-like patterns of folds and creases. Within the spherulit…
Single-crystal X-ray precession i>attcrns of several compositi(>ns in the solid solution series Cas(Fel-pAlp)s()20 (0 _< p ~ 0.69)
In the course of a high-temperature x-ray diffraction study of tetragonal ZrO/sub 2/, a number of previously unreported reflections, which are inconsistent with a body-centered lattice, hare been observed. The intensities of most of these reflections are rather low, but the strongest of these (the (102) reflection) wa…
The fundamental and idealized kinetics of luminescence phenomena in crystalline materials are reviewed. Luminescent decay modes are distinguished on the basis of their time histories into three general categories: the exponential, bimolecular, and electron trap laws. Expressions for the decay of emission intensity are…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Structure of the Salt Sodium Calcium Metaphosphate (Na4CaP6O18)E. J. GriffithCite this: Inorg. Chem. 1962, 1, 4, 962Publication Date (Print):November 1, 1962Publication History Published online1 May 2002Published inissue 1 November 1962https://pubs.acs.org/doi/10.1021/ic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydridic Nature of the "Lower Oxide of Thorium"Leonard I. Katzin, Louis Kaplan, and Thomas SteitzCite this: Inorg. Chem. 1962, 1, 4, 963–964Publication Date (Print):November 1, 1962Publication History Published online1 May 2002Published inissue 1 November 1962https://pubs.ac…
Abstract Es wurden Sinterproben der allgemeinen Formel Li x V 1‐ x O und zum Vergleich lithiumfreie Produkte der allgemeinen Zusammensetzung VO 1± n hergestellt. Röntgenuntersuchungen ergaben in Übereinstimmung mit Leitfähigkeits‐ und Thermokraftmessungen im System Li x V 1‐ x O einen Homogenitätsbereich der VO‐Phase…
A system for levitating liquid metal using a high frequency levitating coil surmounted by a stabilizing ring is described. By adjustment of the ring relative to the coil the liquid metal can be stabilized and steered to any desired position in the system.
Crystal structures, electrical and magnetic properties of Sr(NiW) 0.5 O 3 -Ba(NiW) 0.5 O 3 system were studied in the temperature range from room temperature to about 400°C. The compound of strontium undergoes a phase transition at about 260°C, where the crystal structure which is perovskite-like changes from tetragon…
Abstract The photoisomerization of cis- and trans-azobenzene in an n-hexane solution has been studied in the n-π* and π-π* absorption wave-length regions. The rate of isomerization has always been found to be proportional to the product of the incident light intensity and the concentration of cis- or trans-azobenzene.…
The relationship between the discharge and the depth at the brink of a freely discharging circular section is investigated. Through application of the momentum equation between a section upstream from the brink and a section downstream from the brink, the limits for the brink depth are established from theory. Experim…
Dynamic mechanical loss of solution-grown polyethylene crystals is measured by the suspension method as a function of temperature and the crystalline dispersion (α dispersion) is observed above 40°C in just the same manner as in melt-grown polyethylene. In the temperature range of this dispersion, the ratio of crystal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Fischer Reaction of Cyclohexanone Mesitylhydrazone. Evidence of a 1,4-Methyl MigrationRobert B. Carlin and Mead S. MooresCite this: J. Am. Chem. Soc. 1962, 84, 21, 4107–4112Publication Date (Print):November 1, 1962Publication History Published online1 May 2002Published i…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Conductivity of Alumina Catalyst PelletsR. A. Mischke and J. M. SmithCite this: Ind. Eng. Chem. Fundamen. 1962, 1, 4, 288–292Publication Date (Print):November 1, 1962Publication History Published online1 May 2002Published inissue 1 November 1962https://pubs.acs.org/d…
Abstract The rate of decomposition of dicumyl peroxide in natural rubber has been measured at four temperatures and the results lead to the expression k = 3.9 × 1013e−32500/RT for the rate constant. The crosslinking efficiency is high and is constant over the range 110 to 140°C. The low values found for the ratio of a…
Explosively generated plane waves were passed through plates of duraluminum, iron, and steels of various compositions and heat treatments. X-cut quartz disks of large diameter-to-thickness ratios (≥5) were used to obtain continuous stress-time profiles of elastic-plastic wave structures associated with yielding. For t…