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- D. A. Verner
- 1996

We present a complete set of analytic fits to the non-relativistic photoionization cross sections for the ground states of atoms and ions of elements from H through Si, and S, Ar, Ca, and Fe. Near the ionization thresholds, the fits are based on the Opacity Project theoretical cross sections interpolated and smoothed over resonances. At higher energies, the… (More)

- D A Verner, G J Ferland
- 1995

We present new calculations and analytic ts to the rates of radiative recombination towards H-like, He-like, Li-like and Na-like ions of all elements from H through Zn (Z = 30). The ts are valid over a wide range of temperature, from 3 K to 10 9 K.

- Diane A. Verner, Gregory L. Heileman, Kent G. Budge, Allen C. Robinson
- Scientific Programming
- 1993

- G J Ferland, K T Korista, D A Verner, A Dalgarno
- 1997

We estimate rate coefficients for charge transfer between neutral hydrogen and helium and moderate to highly ionized heavy elements. Although charge transfer does not have much influence on hot collisionally ionized plasmas, its effects on photoionized plasmas can be profound. We present several photoionization models which illustrate the significant effect… (More)

- J. A. Baldwin, A. Crotts, +11 authors D. K. Walter
- 1996

We reexamine the spectroscopic underpinnings of recent suggestions that [O I] and [Fe II] lines from the Orion H II region are produced in gas where the iron-carrying grains have been destroyed and the electron density is surprisingly high. Our new observations show that previous detections of [O I] 5577 were dominated by telluric emission. Our limits are… (More)

- D A Verner, P D Barthel, David Tytler
- 2007

We list wavelengths, statistical weigths and oscilla-tor strengths for 2249 spectral lines arising from the ground states of atoms and ions. The compilation covers all wavelengths longward of the Heii Lyman limit at 227.838 A and all the ion states of all elements from hydrogen to bismuth (Z = 83) for which reliable data are known. We assign experimental… (More)

The calculation of accurate collision strengths for atomic transitions has been a long standing problem in quantitative spectroscopy. Most modern calculations are based on the R-matrix method and problems pertaining to the use of this method have led to a discussion of the accuracy of these results. More in particular, based on an analysis of the spectra of… (More)

- D A Verner, D G Yakovlev
- 2007

We present a compact, uniform and complete set of analytic ts to the partial Hartree-Dirac-Slater photoionization cross sections for the ground state shells of all atoms and ions of elements from H to Zn (Z 30). Comparison with experiment and theory demonstrates generally high accuracy of the ts up to energies of 100 keV.

The calculation of accurate collision strengths for atomic transitions has been a long standing problem in quantitative spectroscopy. Most modern calculations are based on the R-matrix method and problems pertaining to the use of this method have led to a discussion of the accuracy of these results. More in particular, based on an analysis of the spectra of… (More)

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