Volume 19, Issue 4, July 1990
Index of content:
19(1990); http://dx.doi.org/10.1063/1.555862View Description Hide Description
Energy level data are given for the atom and all positive ions of sulfur (Z=16). These data have been critically compiled, mainly from published and unpublished material on measurements and analyses of the optical spectra. We have derived or recalculated the levels for a number of the ions. In addition to the level values in cm− 1 and the parity, the J value and the configuration and term assignments are listed if known. Leading percentages from the calculated eigenvectors are tabulated or quoted wherever available. Ionization energies are given for all spectra.
19(1990); http://dx.doi.org/10.1063/1.555876View Description Hide Description
This compilation of data on the heat capacities,entropies, and phase transitions of organic compounds in the condensed phase supplements the document published earlier on this subject, namely, ‘‘Heat Capacities and Entropies of Organic Compounds in the Condensed Phase’’ by E. S. Domalski, W. H. Evans, and E. D. Hearing, J. Phys. Chem. Ref. Data, 1 3, Suppl. 1, (1984). It provides data on approximately 1300 organic compounds. About half of the articles examined contain data published prior to 1982. A total of 565 articles have been examined, evaluated, and referenced. In addition to values for the heat capacity and entropy at 298.15 K, phase transitions for solid/solid, solid/liquid, and in some instances, solid/gas and liquid/gas are tabulated as encountered from the articles examined and evaluated.
19(1990); http://dx.doi.org/10.1063/1.555878View Description Hide Description
A survey is made of the enthalpies of formation, third law entropies and Gibbs energies available for Krebs cycle and related compounds. These include formate, acetate, succinate, fumarate, glycine, alanine, aspartate and glutamate. The potential of the NAD+/NADH couple is recalculated based on the ethanol/acetaldehyde and isopropanol/acetone equilibria. The reported enzyme catalyzed equilibrium constants of the Krebs cycle reactions are evaluated with estimated errors. These 28 equilibria form a network of reactions that is solved by a least squares regression procedure giving Gibbs energies of formation for 21 Krebs cycle and related compounds. They appear to be accurate to ±0.4 kJ⋅mol− 1 for some compounds but ±1 kJ⋅mol− 1 in less favorable cases. This procedure indicates which third law Δf G and enzyme equilibria are inaccurate, and allows very accurate Δf G to be determined for compounds related to the Krebs cycle by measuring enzymeequilibrium constants.