Volume 8, Issue 2, April 1979
Index of content:
8(1979); http://dx.doi.org/10.1063/1.555594View Description Hide Description
The available body of information on (a) fluorescence, Auger, and Coster‐Kronig yields, (b) radiative and radiationless transition rates, (c) level widths, (d) x‐ray and Auger line widths, (e) x‐ray and Auger spectra, and (f) Coster‐Kronig energies has been used to generate an internally consistent set of values of atomic radiative and radiationless yields for the K shell (5 ?Z?110) and the L subshells (12 ?Z?110). Values of fluorescence yields ω k , ω1, ω2, ω3, Coster‐Kronig yields F1, F1.2, F1.3, F1.3, F2.3. Auger yields a k , a 1, a 2, a 3, and effective fluorescence yields ν1 and ν2 are presented in tables and graphs. Estimates of uncertainties are given. Updated and expanded graphs of partial and total widths of K, L 1, L 2, and L 3 levels are presented as well as a reference list of papers published since about 1972.
8(1979); http://dx.doi.org/10.1063/1.555595View Description Hide Description
Semi‐empirical values of the natural widths of K, L 1, L 2, and L 3 levels, Kα1 and Kα2 x‐ray lines, and K L 1 L 1, K L 1 L 2 and K L 2 L 3 Auger lines for the elements 10?Z?110 are presented in tables and grapahs. Level width Γ i (i=K, L 1,L 2, L 3) is obtained from the relation Γ i =Γ R,i /ω i , using the theoretical radiative rate Γ R,i from Scofield’s relativistic, relaxed Hartree‐Fock calculation and the fluorescence yield ω i from Krause’s evaluation. X‐ray and Auger lines widths are calculated as the sums of pertinent level widths. This tabulation of natural level and line widths is internally consistent, and is compatible with all relevant experimental and theoreticalinformation. Present semi‐empirical widths, especially those of Kα1 and Kα2 x‐rays, are compared with measured widths. Uncertainties of semi‐empirical values are estimated.
8(1979); http://dx.doi.org/10.1063/1.555598View Description Hide Description
This paper presents and discusses the available data and information on the electrical resistivity of alkali elements (lithium,sodium,potassium,rubidium, cesium, and francium) and contains recommended reference values (or provisional or typical values). The compiled data include all the experimental data available from the literature and cover the temperature dependence, pressure dependence, and magnetic flux density dependence. The temperature range covered by the compiled data is from cryogenic temperatures to above the critical temperature of the elements. The recommended values are generated from critical evaluation, analysis, and synthesis of the available data and information and are given for both the total electrical resistivity and the intrinsic electrical resistivity. For most of the elements, the recommended values cover the temperature range from 1 K to 2000 K.
8(1979); http://dx.doi.org/10.1063/1.555599View Description Hide Description
This paper presents and discusses the available data and information on the electrical resistivity of alkaline earth elements (beryllium,magnesium,calcium,strontium,barium, and radium) and contains recommended or provisional reference values. The compiled data include all the experimental data available from the literature. The temperature range covered by the compiled data is from cryogenic temperatures to above the melting temperature of the elements. The recommended values are generated from critical evaluation, analysis, and synthesis of the available data and information and are given for both the total electrical resistivity and the intrinsic electrical resistivity. For most of the elements, the recommended values cover the temperature range from 1 K to 1000 K.
8(1979); http://dx.doi.org/10.1063/1.555600View Description Hide Description
This critical review is a study of the vapor pressure–boiling point data from the triple point to the critical point for CH4– a X a (X=Br, I) and CH4−(a+b+c+d) F a Cl b Br c I d halomethanes. The available data are carefully analyzed and the ’’best’’ data selected. The selection procedure is discussed. Uncertainties in the selected temperatures and pressures are reported. The selected data were fitted to the Antoine equation for data up to 1500 mm Hg pressure and the Wagner equation for data up to the critical point. Antoine constants for nineteen compounds and the Wagner constants for five compounds are reported. The enthalpy of vaporization at 298.15 K and at the normal boiling point have been computed.
8(1979); http://dx.doi.org/10.1063/1.555601View Description Hide Description
The available molecular parameters, fundamental frequencies, potential barrier heights, torsional frequencies, and standard enthalpies of formation at 298.15 K for selected bromoethanes and iodoethane containing one symmetric‐top group have been critically evaluated and recommended values selected. The chemical thermodynamicproperties in the ideal gas state at one atmosphere pressure using the rigid‐rotor harmonic‐oscillator approximation have been calculated for CH3CH2Br, CH3CHBr2, CH3CBr3 C2Br6, and CH3CH2I. The internal rotational contributions have been obtained from the partition function formed by the summation of internal rotation energy levels.
8(1979); http://dx.doi.org/10.1063/1.555602View Description Hide Description
Structural and spectroscopic data and the standard enthalpy of formation 298.15 K for C10H8, α‐C10H1D4, β‐C10H4D4 and C10D8 were reviewed. The selected values were utilized to calculate the ideal gas thermodynamicproperties in the temperature range 0 to 1500 K, using the rigid rotor and harmonic oscillator model. The comparison between the third law entropies and the spectroscopically calculated entropies of C10H8 was studied. The agreement is satisfactory within the experimental uncertainties.
8(1979); http://dx.doi.org/10.1063/1.555603View Description Hide Description
The microwave spectrum of propyne is critically reviewed for information applicable to radio‐astronomy. Molecular data such as the derived rotational constants, centrifugal distortion parameters, hyperfine coupling constants, electric dipole moment, and molecular structure are tabulated. The observed rotational transitions are presented for the astronomically interesting isotopic forms and the lowest lying vibrational state of propyne. Calculated rotational transitions are presented for the ground vibrational state of 12CH3 12C≡ 12CH, 13CH3 12C≡ 12CH, 12CH3 13C≡ 12CH and 12CH3 12C≡ 13CH, and for the vibrationally excited state ν10 of 12CH3 12C≡ 12CH.
8(1979); http://dx.doi.org/10.1063/1.555596View Description Hide Description
Data for the viscosity and thermal conductivity of gaseous and liquid propane have been evaluated and represented by empirical functions developed in previous work. Tables of values are presented for the range 140–500 K for pressures to 50 MPa (? 500 atm). The viscosities are estimated to have uncertainties of about ±5%, with corresponding uncertainties of the thermal conductivities of about ±8%. It is stressed that the data base should be improved. As in our work with other fluids, the anomalous contribution to the thermal conductivity in the vicinity of the critical point is included.