Volume 37, Issue 1, March 2008
Index of content:
37(2008); http://dx.doi.org/10.1063/1.2816952View Description Hide Description
37(2008); http://dx.doi.org/10.1063/1.2789451View Description Hide Description
Energy levels, with classifications and uncertainties, have been compiled for the spectra of the neutral atom and all positive ions of potassium. Wavelengths with classifications, intensities, and transition probabilities are also tabulated. In addition, ground states and ionization energies are listed. For many ionization stages experimental data are available; however for those for which only theoretical calculations or fitted values exist, these are reported.
37(2008); http://dx.doi.org/10.1063/1.2815328View Description Hide Description
The microwave spectrum of acetic acid is critically reviewed andsupplemented with spectral frequency calculations derived from therotation-torsion analysis. A simultaneous analysis of the torsionalground state, , and first and second torsionally excitedstates, and 2, was carried out using the so-called“rho axis method.” The primary objective of this reviewis to provide radio astronomers with complete spectral coverage overthe range for the ground and states, covering rotationalquantum numbers and .
37(2008); http://dx.doi.org/10.1063/1.2735328View Description Hide Description
This compilation is the first in a series of updates to a critical compilation published in 1969 [W. L. Wiese, M. W. Smith, and B. M. Miles, Atomic Transition Probabilities, Vol. II: Sodium through Calcium, NSRDS-NBS Vol. 2 (U.S. GPO, Washington, D.C., 1969)]. Atomic transition probabilities have been critically evaluated and compiled for about 11 400 spectral lines of sodium and magnesium (nuclear charge , respectively). The cited values and their estimated uncertainties are based on our consideration of all available theoretical and experimental literature sources. All ionization stages (except for hydrogenic) are covered, and the data are presented in separate tables for each atom and ion. Separate listings are given for “allowed” (electric dipole) transitions, on the one hand, and for “forbidden” (magnetic dipole plus electric and magnetic quadrupole) transitions, on the other. In each spectrum, lines are grouped into multiplets which are arranged in order of ascending lower and upper-level energies, respectively. For each line, the emission transition probability , the line strength , and (for allowed lines) the absorption oscillator strength are given, together with the spectroscopic designation, the wavelength, the statistical weights, and the energy levels of the lower and upper states. The estimated relative uncertainties of the line strength are also indicated, as are the source citations. We introduce a statistical method that we use to estimate these uncertainties for most of the cited transition rates. We only include those lines whose transition rates are deemed sufficiently accurate to qualify as reference values. Short introductions precede the tables for each ion. The general introduction contains a discussion of the principal criteria for our judgments and our method of data selection and evaluation.