Volume 19, Issue 3, May 1990
Index of content:
19(1990); http://dx.doi.org/10.1063/1.555855View Description Hide Description
The energy levels of the copper atom, in all stages of ionization for which experimental data are available, have been compiled. Ionization energies, either experimental or theoretical, and experimental g‐factors are given. Leading components of calculated eigenvectors are listed.
19(1990); http://dx.doi.org/10.1063/1.555856View Description Hide Description
Data are compiled and evaluated for collision processes of excitation, dissociation,ionization, attachment, and recombination of hydrogen molecules and molecular ions (H + 2, H + 3) by electron impact as well as for properties of their collision products.
19(1990); http://dx.doi.org/10.1063/1.555857View Description Hide Description
Data have been compiled on the cross sections for the collisions of electrons and photons with atomic oxygen (O). The processes considered are total scattering, elastic scattering, momentum transfer, excitations of electronic states (including fine structure levels of the ground state),ionization, and electron attachment. The cross‐section data are presented graphically. Energy levels, transition probabilities and some other properties of atomic oxygen are summarized to aid understanding of the collision processes. The literature was surveyed through December 1988, but more recent data, if they are available to the authors, are included also.
Cross Sections and Swarm Coefficients for H+, H2 +, H3 +, H, H2, and H− in H2 for Energies from 0.1 eV to 10 keV19(1990); http://dx.doi.org/10.1063/1.555858View Description Hide Description
Graphical and tabulated data and the associated bibliography are presented for cross sections for elastic, excitation and ionizationcollisions of H+, H2 +, H3 +, H, H2, and H− with H2 at laboratory energies from 0.1 to 10 keV. Where appropriate, drift velocities and reaction or excitation coefficients are calculated from the cross sections and recommended for use in analyses of swarm experiments and electrical discharges. In the case of H+ in H2, cross sections for momentum transfer, rotational excitation, vibrational excitation, charge transfer, electronic excitation, and ionization are recommended. Energy‐loss or stopping‐power coefficients calculated from these cross sections are much smaller than obtained from stopping‐power theory. There are no relevant energy‐loss experiments for H+ in H2. Drift velocity calculations predict runaway for H+ in H2 for electric field to gas density ratios E/n greater than 700 Td, where 1 Td (townsend)=10− 2 1 V m2. For H2 + in H2, the cross sections include H3 + formation, charge transfer, vibrational and electronic excitation, and ionization. Drift velocities and average cross sections are calculated for E/n≥1 kTd. For H3 + in H2, cross sections for momentum transfer, various charge transfer processes, electronic excitation, and ionization and drift velocities are recommended. In the case of H in H2, cross sections for momentum transfer, rotational excitation, vibrational excitation, charge transfer, H− formation, electronic excitation, and ionization are recommended. For H2 in H2, cross sections for momentum transfer, rotational excitation, vibrational excitation, charge transfer, electronic excitation, and ionization are recommended. In the case of H− in H2, cross sections for momentum transfer, electron detachment, and ionization are recommended and calculated drift velocities are compared with experiment. Collisions of electronically excited states with H2 are not included.
19(1990); http://dx.doi.org/10.1063/1.555859View Description Hide Description
Based on a comprehensive collection of data previously obtained by Thormählen e t a l. on the experimental refractive index of water and steam from the 1870s to the present, a new formulation is presented for the range of 0.2 to 2.5 μm in wave‐length, −10 to +500 °C in temperature and 0 to 1045 kg m− 3 in density. The Lorentz‐Lorentz function or molar refraction, a strong function of wavelength but only weakly dependent on density and temperature, is fitted to a selected set of accurate refractive index data. The NBS/NRC equation of state for water and steam, the new international standard, is used to convert the experimental pressures to density.
The deviations of all experimental data from the formulation are shown. A detailed assessment of the accuracy of the formulation is presented. Although the formulation does not represent to within their accuracy the data from the best sets in the visible range for liquid water below the boiling point, we show that inconsistencies between data sets, and minor deficiencies of the equation of state, prevent further improvement of a formulation based on data over as wide a range as considered here. It is shown that the best refractive index data can be used to discriminate between the various formulations of the equation of state of water and steam. It is demonstrated that several recent formulations of optical properties of liquid water over large ranges of wavelength need improvement in the range covered here. The new formulation is used to generate tables of the refractive index of water and steam at six wavelengths in the visible, near‐infrared and near‐ultraviolet, from 0 to 500 °C and up to 100 MPa in pressure.
19(1990); http://dx.doi.org/10.1063/1.555860View Description Hide Description
Heat capacities of liquid C1 to C1 8 1‐alkanols measured by calorimetric methods were compiled and evaluated. The selected experimental data were fitted as a function of temperature with cubic splines using weighted least squares minimization. The parameters of the cubic spline polynomials and the recommended values for heat capacities are presented. A new quasi‐polynomial equation which permits extrapolation of heat capacities outside the temperature range of experimental values was derived and its parameters for C1 to C1 0 1‐alkanols are presented.
19(1990); http://dx.doi.org/10.1063/1.555875View Description Hide Description
The paper contains new, representative equations for the viscosity and thermal conductivity of carbon dioxide. The equations are based in part upon a body of experimental data that have been critically assessed for internal consistency and for agreement with theory whenever possible. In the case of the low‐density thermal conductivity at high temperatures, all available data are shown to be inconsistent with theoretical expectation and have therefore been abandoned in favor of a theoretical prediction. Similarly, the liquid‐phase thermal conductivity has been predicted owing to the small extent and poor quality of the experimental information. In the same phase the inconsistencies between the various literature reports of viscosity measurements cannot be resolved and new measurements are necessary. In the critical region the experimentally observed enhancements of both transport properties are well represented by theoretically based equations containing just one adjustable parameter. The complete correlations cover the temperature range 200 K≤T<1500 K for viscosity and 200 K≤T≤1000 K for thermal conductivity, and pressures up to 100 MPa. The uncertainties associated with the correlation vary according to the thermodynamic state from ±0.3% for the viscosity of the dilute gas near room temperature to ±5% for the thermal conductivity in the liquid phase. Tables of the viscosity and thermal conductivity generated by the representative equations are provided to assist with the confirmation of computer implementations of the calculation procedure.