Volume 21, Issue 5, September 1992
Index of content:
21(1992); http://dx.doi.org/10.1063/1.555921View Description Hide Description
We have critically compiled the atomic transition probabilities of Ar ii lines by combining recent high‐accuracy lifetime data with branching‐ratio emission measurements. We present several comparisons of the various literature data, including theoretical results, and we discuss our assessment procedure in detail. On the basis of this procedure, we present an extension list of critically evaluated transition probabilities with uncertainty estimates.
The Solubility of Some Sparingly Soluble Salts of Zinc and Cadmium in Water and in Aqueous Electrolyte Solutions21(1992); http://dx.doi.org/10.1063/1.555909View Description Hide Description
The literature on the solubility of the sparingly soluble inorganic salts of zinc and cadmium in water and in aqueous electrolyte solutions has been reviewed. The solubility data have been compiled and evaluated. Recommended or tentative values of the solubilities and the solubility products have been given when warrented. Auxiliary thermodynamic and crystallographic data useful in the interpretation of solubility data are given. For the many zinc and cadmium substances for which only limited solubility data are available, unevaluated values are given in an annotated bibliography with emphasis on solubility data published since 1950.
Franck–Condon Factors, r‐Centroids, Electronic Transition Moments, and Einstein Coefficients for Many Nitrogen and Oxygen Band Systems21(1992); http://dx.doi.org/10.1063/1.555910View Description Hide Description
Air fluorescencemodels require accurate Franck–Condon factors and Einstein coefficients for analyzing the intensities of N2, N+ 2, and O+ 2 emissions produced by electron bombardment of air, such as in the aurora, high‐altitude nuclear explosions, and rocket‐borne electron gun experiments. In our previous report, improved vibrational and rotational constants based on the latest available spectroscopic measurements for several excited and ionic states important in air fluorescence modeling were derived. These constants have been used in the present work to calculate band origins, Franck–Condon factors, and r‐centroids for many band systems of nitrogen and oxygen. These results, together with electronic transition moments obtained from published papers or derived here from published emission data and measured upper‐state lifetimes, have been used to compute Einstein coefficients by the r‐centroid method. Einstein coefficients by integration of the product of the electronic transition moment function and vibrational wavefunctions have also been computed for comparison. For band systems involving ‘‘perturbed’’ electronic states, Einstein coefficients have been derived by simply normalizing published emission data to measured upper‐state lifetimes. In this report, tables of band origin wave‐lengths and wavenumbers, Franck–Condon factors, r‐centroids, electronic transition moments, and Einstein coefficients are presented for 17 N2, N+ 2, and O+ 2 band systems. Plots of most of the electronic transition moment functions used in these calculations are also given. In addition, tables of Franck–Condon factors only are presented for 16 other band systems of nitrogen and oxygen, and tables of band wavelengths and Einstein coefficients are presented for 3 band systems having ‘‘perturbed’’ upper states.