Volume 26, Issue 2, March 1997
Index of content:
26(1997); http://dx.doi.org/10.1063/1.556012View Description Hide Description
Literature data (through mid-1996) concerning the gas-phase reactions of alkanes and alkenes (including isoprene and monoterpenes) leading to their first generation products are reviewed and evaluated for tropospheric conditions. The recommendations of the most recent IUPAC evaluation [J. Phys. Chem. Ref. Data, 26, No. 3 (1997)] are used for the ⩽C3organic compounds, unless more recent data necessitates reevaluation. The most recent review and evaluation of Atkinson [J. Phys. Chem. Ref. Data, Monograph 2, 1 (1994)] concerning the kinetics of the reactions of OH radicals, radicals, and is also updated for these two classes of volatile organic compounds.
26(1997); http://dx.doi.org/10.1063/1.556007View Description Hide Description
Steroids are an important source of chiral mesophases. The melting behavior and mesomorphic properties of homologous series of steroidal derivatives have been extracted from the literature, tabulated, and discussed. The tables provide the reader with an evaluated compilation of the type of mesophases found for the individual compounds, including their transition temperatures. Where the literature gives more than one set of data for a specific substance, one has been chosen as the main reference, but all alternatives are listed in the footnotes. The data can be used for statistical analysis to show the specific role of substructures within the steroidal framework.
New Survey of Electron Impact Cross Sections for Photoelectron and Auroral Electron Energy Loss Calculations26(1997); http://dx.doi.org/10.1063/1.556008View Description Hide Description
Newly surveyed sets of energy loss cross sections are presented for N O and O. The work was motivated by a number of new electron energy lossmeasurements in the late 1980s and early 1990s and recent selected review articles. Each set includes a total ionization cross section and excitation cross sections that correspond to all important non-ionizing energy loss channels for that species. A total cross section for each species is constructed by summing the elasticscattering cross section with the ionization and excitation cross sections. The sum is compared to a measured total cross section obtained from electron transmission experiments. Good agreement is achieved for each of the three species. A loss function is also constructed for each species and compared with the Bethe formula above 100 eV. Good agreement is also achieved in energy loss which is dominated by ion and secondary electron production. Fluxes of photoelectrons and auroral electrons have been calculated for the new sets of energy loss cross sections as well as our previous sets. No substantial differences occur using the new description of energy loss.
Phase Diagrams and Thermodynamic Properties of Binary and Ternary Systems Based on Nitroaromatic Compounds26(1997); http://dx.doi.org/10.1063/1.556009View Description Hide Description
The phase diagram data of 226 binary organic systems based on nitroaromatic compounds were critically evaluated with the aid of a computer-coupled thermodynamic/phase diagram analysis. The results of this analysis include the excess Gibbs energies of all solution phases as well as the Gibbs energies of fusion and formation of intermediate compounds. These quantities were used to calculate a bestphase diagram for each system. The phase diagrams of seven ternary systems were calculated from the evaluated thermodynamic data of the binary subsystems with the use of the Kohler interpolative model and compared with the experimental diagrams.