Index of content:
Volume 22, Issue 2, March 1993
22(1993); http://dx.doi.org/10.1063/1.555941View Description Hide Description
Wavelengths and their classifications have been compiled for the spectra of the atom and all positive ions of sulfur (Z=16). The selections of data are based on the compilations of energy levels by Martin, Zalubas, and Musgrove in 1990, with some updating from the more recent literature. Wavelengths (or wavenumbers) calculated from the differences of the energy levels are given along with the observed values for all classified lines; these calculated wavelengths should in general be more accurate than the observed values wherever the two values differ significantly. Calculated wavelengths are also given for a number of lines that have not yet been observed, including some important forbidden transitions. The most complete data are given in separate tables for the different spectra. No limitation has been imposed on the wavelength range of the classified lines, except for the omission of x‐ray transitions in the neutral atom. Two finding lists are also included, one for S I through S III and the other for S IV through S XVI.
22(1993); http://dx.doi.org/10.1063/1.555937View Description Hide Description
The thermodynamic properties of the mono‐olefins with carbon numbers greater than C4 were reviewed. Properties included critical properties,vapor pressures, densities, second virial coefficients, enthalpies of vaporization, heat capacities, and enthalpies of combustion. Enthalpies of formation for the liquid, gas, and ideal‐gas state at 298.15 K were calculated for 47 compounds based on the experimental values. Sufficient experimental information was available to allow the calculation of entropies,enthalpies, and Gibbs energies for the ideal‐gas state (over approximately a 100 K range near 250 K to 400 K) for 14 compounds. Comparisons were made with experimental isomerization equilibria, isomerizationenthalpies, and group‐contribution estimates for enthalpies of formation and entropies. ‘‘Gaps’’ in the available data were identified and recommendations for additional experiments are made. Evidence for errors in several of the original experimental results is presented, and revised values are suggested.
The Thermodynamic Behavior of the CO2‐H2O System from 400 to 1000 K, up to 100 Mpa and 30% Mole Fraction of CO222(1993); http://dx.doi.org/10.1063/1.555938View Description Hide Description
A model is presented for the thermodynamic properties of the aqueous mixture of carbon dioxide, up to 30 mol% composition, in a large range of temperatures (400–1000 K) and pressures (0–100 MPa) around the critical point of water. The model for the Helmholtz free energy of the mixture is based on the principle of generalized corresponding states, with the NBS/NRC Steam Tables as the reference state for pure water. Input to the model are data for the critical line of the mixture, apparent molar volume and pVTx data in supercritical water, phase boundaries, excess enthalpies and mixture second virial coefficient data. Comparisons are presented with those data, with Henry’s constants and with other formulations available for this system. Phase boundaries and tabulated values of molar volumes, enthalpies, and fugacities are presented along 35 isobars from 0.05 to 100 MPa, for four compositions, x=0.05, 0.10, 0.20, and 0.30, respectively, at 19 temperatures in the range of 400 to 1000 K. For the same pressures and temperatures, we also list the infinite‐dilution (standard state) properties: partial molar volume, enthalpy,heat capacity and fugacity coefficient of the solute CO2. The Fortran codes for generating these properties are listed in Appendix B.
22(1993); http://dx.doi.org/10.1063/1.555939View Description Hide Description
Equilibrium constants and enthalpy changes for reactions catalyzed by oxidoreductases have been compiled. For each reaction the following information is given: the reference for the data; the reaction studied; the name of the enzyme used and its Enzyme Commission number; the method of measurement; the conditions of measurement(temperature, pH, ionic strength, and the buffer(s) and cofactor(s) used); the data and an evaluation of it; and, sometimes, commentary on the data and on any corrections which have been applied to it. The thermodynamic conventions pertinent to the tabulation of equilibrium data are discussed. A distinction is made between those thermodynamic quantities which pertain to the overall biochemical reaction and those which pertain to a reference reaction that involves specific species. The data from 205 references have been examined and evaluated. Chemical Abstract Service Registry Numbers have been assigned to the substances involved in these various reactions. There is a cross reference between the substances and the Enzyme Commission numbers of the enzymes used to catalyze the reactions in which the substances participated.