Volume 9, Issue 3, July 1980
Index of content:
9(1980); http://dx.doi.org/10.1063/1.555623View Description Hide Description
A list of several hundred free‐radical reactions which occur during the low temperature (700–850 K) pyrolysis of small n‐alkane molecules has been assembled and a set of reliable, self‐consistent Arrhenius rate parameters has been assigned on the basis of experiment, theory,thermochemical estimates and structural analogy. Rate parameters have been recommended for the following types of reactions, with the number of each type in parentheses: initiation (32), recombination (135), disproportionation (108), H‐transfer (112), decomposition (41), addition (58), and isomerization (11), givin a total of 505 reactions. This compilation is intended for use in assembling reaction matrices in computational modeling studies of the thermal reactions of hydrocarbon molecules.
9(1980); http://dx.doi.org/10.1063/1.555624View Description Hide Description
Refractive index data for silicon and germanium were searched, compiled, and analyzed. Recommended values of refractive index for the transparent spectral region were generated in the ranges 1.2 to 14 μm and 100–740 K for silicon, and 1.9 to 16 μm and 100–550 K for germanium. Generation of these values was based on a dispersion equation which best fits selected data sets covering wide temperature and wavelength ranges. Temperature derivative of refractive index was simply calculated from the first derivative of the equation with respect to temperature. The results are in concordance with the existing d n/d T data.
9(1980); http://dx.doi.org/10.1063/1.555625View Description Hide Description
The microwave spectrum of methyl cyanide is critically reviewed for information applicable to radio‐astronomy. Molecular data such as the derived rotational constants, centrifugal distortion parameters, hyperfine coupling constants, electric dipole moment and molecular structure are tabulated. The observed rotational transitions are presented for the astronomically interesting isotopic forms and the lowest lying vibrational state of methyl cyanide. Calculated rotational transitions are presented for the ground vibrational state of 12CH3 12C14N, 13CH3 12C14N, 12CH3 13C14N, 12CH3 12C15N, and for the vibrationally excited state ν8 of 12CH3 12C14N.
A review, evaluation, and correlation of the phase equilibria, heat of mixing, and change in volume on mixing for liquid mixtures of methane + propane9(1980); http://dx.doi.org/10.1063/1.555626View Description Hide Description
The available experimental data for liquid‐vapor equilibria, heat of mixing, and change in volume on mixing for the methane + propane system have been reviewed and where possible evaluated for consistency. The derived properties chosen for analysis and correlation were liquid mixture excess Gibbs free energies, Henry’s constants, and K values. Data sets, selected on the basis of the consistency tests applied, were correlated as a function of temperature and composition to provide internally consistent sets of property values suitable for engineering design calculations.
9(1980); http://dx.doi.org/10.1063/1.555627View Description Hide Description
A study has been made of the saturationproperties of D2O from the triple point temperature to 325 °C, in the light of information on the saturationproperties of H2O. Saturated liquid volumes have been determined by extrapolation to saturation pressure of relatively abundant liquid phase data (corrected to 100% D2O). Saturated liquid enthalpy has been determined by extrapolation of liquid phase specific heat data, and integration along the saturation line, allowing for the compressibility effect. Saturated vapor volumes have been determined by use of an extended virial equation formulated for H2O and corrected for D2O. Saturated vapor enthalpies have been determined by use of the Clapeyron equation, and compared to vapor enthalpies calculated from the extended virial equation. Saturated liquid and vapor volumes have been extrapolated to the critical temperature to allow an inference of the critical density.
The solubility of some sparingly soluble lead salts: An evaluation of the solubility in water and aqueous electrolyte solution9(1980); http://dx.doi.org/10.1063/1.555628View Description Hide Description
The literature on the solubility of sparingly soluble lead salts in water and in aqueous electrolyte solution was reviewed. Solubility data were compiled and evaluated. Recommended and tentative values of the solubilities are presented. A partial compilation of solubility products and of complex ion formation constants are given. Where possible the solubility product values have been checked for consistency against thermodynamic data from sources other than solubility measurements.