Volume 1, Issue 1, January 1972
Index of content:
1(1972); http://dx.doi.org/10.1063/1.3253094View Description Hide Description
Diffusion coefficients of binary mixtures of dilute gases are comprehensively compiled, critically evaluated, and correlated by new semi‐empirical expressions. There are seventy‐four systems for which the data are sufficiently extensive, consistent and accurate to allow diffusion coefficients to be recommended with confidence. Deviation plots are given for most of these systems. Almost every gaseous diffusion coefficient which was experimentally determined and reported prior to 1970 can be obtained from the annotated bibliography and table of gas pairs.
A detailed analysis of experimental methods is given, and intercomparison of their results helps establish reliability limits for the data, which depend strongly on temperature. Direct measurements are supplemented by calculations based on knowledge of intermolecular forces derived from independent sources—molecular beam scattering for high temperatures, and London dispersion constants for low temperatures. In addition, diffusion coefficients for several mixtures are obtained from experimental data on mixture viscosities and thermal diffusion factors. Combination of all these results gives diffusion coefficients over a very extensive temperature range, from very low temperatures to 10 000 K.
All data are corrected for composition dependence and for quantum effects. New semi‐empirical equations are derived for making such corrections easily.
1(1972); http://dx.doi.org/10.1063/1.3253095View Description Hide Description
Selected values of critical supersaturations for homogeneous nucleation of droplets from the vapor and for heterogeneous nucleation of droplets on the natural stationary concentration of gaseous ions are tabulated and plotted, and a rationale is given for selection of these data.
1(1972); http://dx.doi.org/10.1063/1.3253096View Description Hide Description
1(1972); http://dx.doi.org/10.1063/1.3253097View Description Hide Description
This atlas summarizes the results of a recent investigation of the carbon monoxide absorptionspectrum between 1060 and 1900 Å. Twelve electronic transitions are observed in this region; four electric dipole allowed electric transitions from the ground state X 1Σ+ to the A 1Π, B 1Σ+, C 1Σ+, and E 1Π states, and eight forbidden transitions to the a′ 3Σ+, e 3Σ‐, a 3Π, D 1Δ, d 3Δ i , I 1Σ‐, j 3Σ+, and c 3Π states. The following items are presented in the atlas:
(1) A photograph of the spectrum with band assignments;
(2) a table of band head measurements and assignments arranged by wavelength;
(3) a summary of the spectroscopic constants and potential curve for each electronic state;
(4) a line list, arranged by wavelength, of the observed rotational lines of the allowed transitions.
1(1972); http://dx.doi.org/10.1063/1.3253098View Description Hide Description
The compilations of fundamental vibrational frequencies of molecules previously published as NSRDS—NBS—6, NRSD—NBS—11, NSRDS—NBS—17, and NSRDS—NBS—39, are extended to 58 additional molecules. Selected values of the fundamental vibrational frequencies are given for each molecule, together with observed infrared and Raman spectral data and citations to the original literature. The selection of vibrational fundamentals has been based on careful studies of the spectral data and comprehensive normal‐coordinate analyses. An estimate of the accuracy of the selected values is included. The tables provide a convenient source of information for those who require vibrational energy levels and related properties in molecular spectroscopy, thermodynamics, analytical chemistry, and other fields of physics and chemistry.