Volume 10, Issue 2, April 1981
Index of content:
Ion product of water substance, 0–1000 °C, 1–10,000 bars New International Formulation and its background10(1981); http://dx.doi.org/10.1063/1.555643View Description Hide Description
This paper is the background for a new international formulation for the ion product of water substance (May 1980) issued by the International Association for the Properties of Steam. The ion product of water (K w) is represented by an equation, based on density and two quadratic functions of reciprocal absolute temperature, for use from 0 to 1000 °C and 1 to 10,000 bars pressure. The equation is believed to describe within ±0.01 units of log K w * (where K w * equals K w/(mol kg−1)2) many of the measurements at saturated vapor pressure up to 200 °C, and to within ±0.02 units up to the critical temperature (374 °C). It also describes within the experimental uncertainty the several sets of measurements at high pressures and should provide values within ±0.05 and 0.30 units at low and high temperatures, respectively.
Atomic transition probabilities for iron, cobalt, and nickel (A critical data compilation of allowed lines)10(1981); http://dx.doi.org/10.1063/1.555644View Description Hide Description
Atomic transition probabilities for about 5100 spectral lines of the elements iron,cobalt, and nickel in all stages of ionization have been critically evaluated and compiled. All available literature sources have been considered. Systematic trends along isoelectronic sequences have been exploited to predict oscillator strengths (f‐values) whenever no data were available in the literature. The data are presented in separate tables for each element and stage of ionization and are arranged according to multiplets and, where appropriate, also according to transition arrays and increasing quantum numbers. For each line the transition probability for spontaneous emission, the absorptionoscillator strength, and the line strength are given, along with the spectroscopic designation, the wavelength, the statistical weights, and the energy levels (when available) of the upper and lower atomic states. In addition, the estimated accuracy and the literature reference are indicated. In short introductions which precede the tables for each spectrum, the main justifications for the choice of the adopted data and for the accuracy ratings are discussed. A general introduction contains additional details on the evaluation procedure.