摘要:

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, Monograph2, 1 (1994)] concerning the kinetics of the reactions of OH radicals,NO3radicals, andO3is also updated for these two classes of volatile organic compounds. ©1997 American Institute of Physics and American Chemical Society.

ISSN:0047-2689    

DOI:10.1063/1.556012

出版商:AIP    

年代:1997

数据来源: AIP

摘要:

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. ©1997 American Institute of Physics and American Chemical Society.

ISSN:0047-2689    

DOI:10.1063/1.556007

出版商:AIP    

年代:1997

数据来源: AIP

摘要:

Newly surveyed sets of energy loss cross sections are presented for N2,O2,and O. The work was motivated by a number of new electron energy loss measurements 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 elastic scattering 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. ©1997 American Institute of Physics and American Chemical Society.Key words:Auroral electron flux; Bethe formula; elastic and total scattering cross sections; electron impact; energy loss cross sections for N2, O2and O; inelastic cross section; ionization cross section; photoelectron flux.

ISSN:0047-2689    

DOI:10.1063/1.556008

出版商:AIP    

年代:1997

数据来源: AIP

摘要:

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 abestphase 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.©1997 American Institute of Physics and American Chemical Society.Key words:phase diagram; thermodynamic properties.

ISSN:0047-2689    

DOI:10.1063/1.556009

出版商:AIP    

年代:1997

数据来源: AIP