Volume 10, Issue 4, October 1981
Index of content:
Rate constants for the decay and reactions of the lowest electronically excited singlet state of molecular oxygen in solution10(1981); http://dx.doi.org/10.1063/1.555655View Description Hide Description
The available rate data on the reactivity and physical deactivation of molecular oxygen in its first electronic excited state (1Δg) in liquid solution have been critically compiled. Where possible, relative rates reported in the literature have been normalized to standard values selected by a statistical analysis of the experimental data. Second order rate constants for the deactivation and chemical reaction of singlet oxygen are reported for 670 compounds. Additionally, psuedo first order rate constants (k d ) for solvent deactivation of singlet oxygen are reported for 50 different solvents.
10(1981); http://dx.doi.org/10.1063/1.555649View Description Hide Description
The heat capacity of poly(oxymethylene), poly(oxyethylene), poly(oxytrimethylene), poly(oxytetramethylene), poly(oxyoctamethylene), poly(oxypropylene), Poly(oxymethyleneoxyethylene), poly(oxymethyleneoxytetramethylene), poly(oxy‐1,4‐phenylene), poly(oxy‐2,6‐dimethyl‐1,4‐phenylene), ploy(oxy‐2,6‐diphenyl‐1,4‐phenylene) and poly[oxy‐2,2‐bis(chloromethyl)trimethylene] is reviewed on the basis of measurements on 35 samples reported in the literature. The crystallinity dependence is critically evaluated and a set of recommended data for each polyoxide is derived. Entropy,enthalpy, and Gibbs energy functions are calculated. The data have been compared to that of polyethylene and the contribution of ‐O‐group has been evaluated. This paper is the third in a series which will ultimately cover all heat capacity measurements on linear macromolecules.
10(1981); http://dx.doi.org/10.1063/1.555650View Description Hide Description
The heat capacity of polypropylene from 0 K to 600 K is reviewed on the basis of measurements on 20 samples reported in the literature. The crystallinity dependence is critically evaluated and a set of recommended data for completely crystalline and amorphous polypropylene are derived. The effect of tacticity on the heat capacity is also evaluated. Entropy,enthalpy, and Gibbs energy functions are calculated. This paper is the fourth in a series of publications which will ultimately cover all heat capacity measurements on linear macromolecules.
Tables of N2O absorption lines for the calibration of tunable infrared lasers from 522 cm−1 to 657 cm−1 and from 1115 cm−1 to 1340 cm−110(1981); http://dx.doi.org/10.1063/1.555651View Description Hide Description
Data from the literature has been critically selected and refitted by least squares to provide accurate vibrational band centers and rotational constants for three bands of N2O. The line positions of the bands have been calculated from the constants of the fits to provide accurate absorption line positions to serve as wavelength standards in the regions of 522 cm−1 to 657 cm−1 and from 1115 cm−1 to 1340 cm−1 in the infrared.
10(1981); http://dx.doi.org/10.1063/1.555652View Description Hide Description
The available data on methane are critically reviewed for information applicable to radio astronomy. Molecular data such as rotational constants, centrifugal distortion constants, and the distortion electric dipole moment are presented for 12CH4 and 13CH4. Observed microwave, infrared‐microwave double resonance, and molecular beammeasurements of (ΔJ = 0) frequencies are tabulated along with experimental uncertainties which represent estimated 95% confidence limits. For 12CH4, these data have been analyzed to predict all Q‐branch rotational transitions for J?20; the predictions are presented with 95% confidence limits which have been calculated from the analysis.
10(1981); http://dx.doi.org/10.1063/1.555653View Description Hide Description
The energy levels of the cobalt atom in all of its stages of ionization, derived from analyses of atomic spectra, have been critically compiled. In cases where only line classifications are reported in the literature, level values have derived. Electron configurations, term designations, J‐values, experimental g‐values, leading percentages and ionization energies are included.
10(1981); http://dx.doi.org/10.1063/1.555654View Description Hide Description
The Henry’s law constants (air‐water partition coefficients) of hydrophobicorganic compounds of environmental concern are reviewed. An outline of the thermodynamic principles which govern the relationships between vapor pressure,solubility and Henry’s law constant for solid and liquidcompounds is presented and experimental techniques for obtaining these quantities with the required accuracy are discussed. Vapor pressure,solubility, and Henry’s law constant data are tabulated and reviewed for a total of 150 compounds in 12 tables consisting of gaseous, liquid and solid alkanes, cycloalkanes, alkenes, alkynes, monoaromatics, polynuclear aromatics, halogenated alkanes, alkenes and aromatics, and selected pesticides.