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X‐ray powder patterns on anhydrous sodium palmitate show that the five phases already known to occur between crystal and isotropic melt can be grouped into two basic structures. Both structures are liquid crystalline, i.e., crystalline in the direction of the long spacing and liquid‐like...
The absorption coefficient for hydrogen peroxide vapor in the wave‐length range 1850–2200A was determined. A careful redetermination of the absorption coefficients for the vapor and for aqueous solutions at 2537A was also made.
Poisoning films of exceptional thermal stability are formed on a platinum catalyst when heated in a silicone vapor (hexamethyldisiloxane) at pressures of the order 10 −3 mm. These films prevent the combination of hydrogen and oxygen at low pressures and are not removed until heated to about...
An approximate study is made of the restricted rotation of a symmetrical diatomic molecule near a surface. This makes possible some calculations concerning the BET constant C=R exp(ϵ 1 —Λ)/ kT, and especially the factor R (which is customarily set equal to unity). Cassie has pointed out that...
It has been found possible to develop perturbation operators for the centrifugal distortion terms that permit an approximate evaluation to be made of their contribution to the asymmetric rotor energy levels for large values of J. The procedure is based upon the asymptotic ( J →∞) similarity...
Values are computed for the viscosity, thermal conductivity, and coefficient of self‐diffusion, as functions of temperature, for the following gases: neon (60°−200°K), argon (110°−290°K), krypton (150°−370°K), and xenon (210°−550°K). The method of calculation is the same as that...
Phosphors with a bright visible fluorescence and a long lasting afterglow can be prepared by grinding potassium chloride with small amounts of a thallous salt in a mortar. The character of the luminescence spectra and the phosphorescence decay depends on the thallium concentration. The behavior...
Valence‐type force constants, including several interaction terms, have been deduced from some of the experimentally observed fundamental vibration frequencies of the molecular sequence C X 4 , C X 3 Y , C X 2 Y 2 , C XY 3 , and C Y 4 in which X may be chlorine or bromine, Y hydrogen or...
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