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It is shown that an excited sensitizer can transfer its energy simultaneously to two activators, under suitable conditions, leading to two emitted photons per incident higher energy photon. The probability of this transfer process is computed, and the process is shown to be experimentally feasible.
The de Haas-van Alphen effect in the magnetic susceptibility of graphite has been interpreted by applying the susceptibility formula for general bands of Lifschitz and Kosevich to the band model of Slonczewski. The majority electrons and holes are responsible for the two periods of oscillation of the susceptibility. T…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction Kinetics in Differential Thermal AnalysisH. E. KissingerCite this: Anal. Chem. 1957, 29, 11, 1702–1706Publication Date (Print):November 1, 1957Publication History Published online1 May 2002Published inissue 1 November 1957https://pubs.acs.org/doi/10.1021/ac60131a045…
The effect of magnetic annealing at 375\ifmmode^\circ\else\textdegree\fi{}K on the room-temperature anisotropy of a series of six single crystals in the composition series ${\mathrm{Co}}_{x}{\mathrm{Fe}}_{3\ensuremath{-}x}{\mathrm{O}}_{4}$, in the range of $x$ values between 0.0 and 0.15, is investigated. The anneal-i…
Far infrared and millimeter microwave transmission experiments through thin superconducting lead and tin films are reported. The frequency range covered corresponds to photon energies from 0.3 to $40k{T}_{c}$. The measurements include the previously unexplored frequency region in which a superconductor changes from an…
The corrosion resistance of six different grades of stainless steel was investigated in air-saturated and nitrogen-saturated sulfuric acid solutions at 30, 50, and 70 C. The results for the various grades are presented in terms of “active-passive” regions that depend on acid concentration, temperature, and type of aer…
The tensile yield and fracture strengths of a structural steel have been measured before and after irradiation with neutrons. The fracture strength increases with irradiation at the same rate as the yield strength and the embrittlement cannot be ascribed to a loss of cohesive strength. Measurements have been made of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Molecular Structure of Polyethylene. VII. Melt Viscosity and the Effect of Molecular Weight and Branching1W. L. Peticolas and J. M. WatkinsCite this: J. Am. Chem. Soc. 1957, 79, 19, 5083–5085Publication Date (Print):October 1, 1957Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeometric Heterogeneity in the Adsorption of Nitrogen on Graphitized Carbon SurfacesDonald GrahamCite this: J. Phys. Chem. 1957, 61, 10, 1310–1313Publication Date (Print):October 1, 1957Publication History Published online1 May 2002Published inissue 1 October 1957https://doi…
Measurements of elastic modulus and mechanical loss at audio-frequencies have been obtained on irradiated and nonirradiated specimens of polyhexamethylene adipamide over a broad temperature range extending from 80°K to 600°K. The irradiations were carried out at the Brookhaven and Penn State Reactors. The internal fri…
Spherulite growth rates have been measured in two polyamides, 66 and 6 nylon, at temperatures ranging from 38 to 141° below the melting points using a moving photomicrographic technique. At constant temperature, the spherulite radius increases at a constant rate. This isothermal growth rate constant is temperature dep…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Diffraction of Molecular Compounds of Long-chain Saturated Fatty Acids. II. Some Further Observations on the Diffraction of Molecular Compounds of Acetamide and Long-chain Saturated Fatty AcidsRobert T. O'Connor, Robert R. Mod, Mildred D. Murray, Frank C. Magne, and Ev…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Conductivities of Some Liquid Nitrate EstersD. L. Hildenbrand and J. A. HappeCite this: J. Phys. Chem. 1957, 61, 10, 1415–1417Publication Date (Print):October 1, 1957Publication History Published online1 May 2002Published inissue 1 October 1957https://doi.org/10.…
The use of highly alloyed materials to combat corrosion is discussed and extensive data are given. The following molybdenum-bearing alloys are considered at length: nickel-molybdenum alloy, nickel-molybdenum-chromium alloy, and nickel-chromium-iron-molybdenum alloy. Attention is given also to cobalt-base alloys and si…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVapor Pressures of Some Phosphate and Phosphonate EstersAlan Dobry and Richard KellerCite this: J. Phys. Chem. 1957, 61, 10, 1448–1449Publication Date (Print):October 1, 1957Publication History Published online1 May 2002Published inissue 1 October 1957https://pubs.acs.org/do…
A liquid tin solution calorimeter has been constructed for determining the heats of formation of alloy phases from the heats of solution of the alloys and of the pure component metals in liquid tin. The design of the calorimeter is presented, and the experimental procedures and calculation methods are described and il…
The sulfide corrosion cracking behavior of Type 4140 bolts was studied in H2S-H2O systems at temperatures of 20 to 120 C and at pressures of 1 to 17 atmospheres. The susceptibility to cracking increased with increasing bolt hardness, increasing applied stress, increasing amounts of plastic deformation, and decreasing…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption from Solution of Stearic Acid on Iron: Effect on Electrode PotentialJohn J. Bordeaux and Norman HackermanCite this: J. Phys. Chem. 1957, 61, 10, 1323–1327Publication Date (Print):October 1, 1957Publication History Published online1 May 2002Published inissue 1 Octo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVinylidene Fluoride – Hexafluoropropylene CopolymerStanley Dixon, D. R. Rexford, and J. S. RuggCite this: Ind. Eng. Chem. 1957, 49, 10, 1687–1690Publication Date (Print):October 1, 1957Publication History Published online1 May 2002Published inissue 1 October 1957https://pubs…
A study of the Zeeman effect of absorption lines of GdCl3·6H2O and its dependence on the orientation of the crystal has given the constants for the magnetic ellipsoids for the ground state and 11 excited states. Evidence is presented for identifying the first three absorption groups as transitions from 8S to 6P7/2, 6P…