Volume 31, Issue 3, September 2002
Index of content:
31(2002); http://dx.doi.org/10.1063/1.1480097View Description Hide Description
The recommended vapor–liquid equilibrium (VLE) data for 39 binary n-alcohol–n-alkane systems have been obtained after critical evaluation of all data (490 data sets) reported in the open literature up to the middle of 2001. The evaluation procedure consisted in combining the thermodynamic consistency tests, data correlation, comparison with enthalpy of mixing data, and comparison of VLE data for various mixtures. The data were correlated with equations based on the local compositions concept as well as with the equation of state appended with a chemical term (EoSC) proposed by Góral. The recommended data are presented in the form of individual pages containing tables of data, figures, and auxiliary information. Each page corresponds to one system and contains three isotherms (spaced by at least 15 K) and one isobar (preferably at 101.32 kPa). Experimental gaps were completed with the predicted data.
31(2002); http://dx.doi.org/10.1063/1.1481879View Description Hide Description
Cross section data have been compiled for electron collisions with carbon dioxide molecules, based on 75 references. Collision processes considered are: total scattering, elastic scattering, momentum transfer, excitations of vibrational and electronic states, ionization, electron attachment, and emission of radiation. Molecular properties of are summarized as far as they are helpful in understanding those collisional processes. With an evaluation of the compiled data, recommended values of the cross section are presented in a tabular form. The literature was surveyed through early 2001, but more recent data available to the author are also considered.
Doppler Broadening and its Contribution to Compton Energy-Absorption Cross Sections: An Analysis of the Compton Component in Terms of Mass-Energy Absorption Coefficient31(2002); http://dx.doi.org/10.1063/1.1481880View Description Hide Description
Compton energy absorption cross sections are calculated using the formulas based on a relativistic impulse approximation to assess the contribution of Doppler broadening and to examine the Compton profile literature and explore what, if any, effect our knowledge of this line broadening has on the Compton component in terms of mass–energy absorption coefficient. Compton energy-absorption cross sections are evaluated for all elements, and for photon energies 1 keV–100 MeV. Using these cross sections, the Compton component of the mass–energy absorption coefficient is derived in the energy region from 1 keV to 1 MeV for all the elements The electron momentum prior to the scattering event should cause a Doppler broadening of the Compton line. The momentum resolution function is evaluated in terms of incident and scatteredphoton energy and scattering angle. The overall momentum resolution of each contribution is estimated for x-ray and γ-ray energies of experimental interest in the angular region 1°–180°. Also estimated is the Compton broadening using nonrelativistic formula in the angular region 1°–180°, for 17.44, 22.1, 58.83, and 60 keV photons for a few elements (H, C, N, O, P, S, K, and Ca) of biological importance.
Experimental Stark Widths and Shifts for Spectral Lines of Neutral and Ionized Atoms (A Critical Review of Selected Data for the Period 1989 Through 2000)31(2002); http://dx.doi.org/10.1063/1.1486456View Description Hide Description
A critical review of the available experimental data on Stark widths and shifts for spectral lines of nonhydrogenic neutral atoms and positive ions has been carried out. The review covers the period from 1989 through the end of 2000 and represents a continuation of earlier critical reviews up to 1988. Data tables containing the selected experimental Stark broadening parameters are presented with estimated accuracies. Guidelines for the accuracy estimates, developed during the previous reviews, are summarized again. The data are arranged according to elements and spectra, and these are presented in alphabetical and numerical order, respectively. A total of 77 spectra are covered, and the material on multiply charged ions has significantly increased. Comparisons with comprehensive calculations based on semiclassical theory are made whenever possible, since the comparison with theory has often been a principal motivation for the experiments.