Wolfgang L. Wiese

Experimental Stark Widths and Shifts for Spectral Lines of Neutral and Ionized Atoms (A Critical Review of Selected Data for the Period 1989 Through 2000)

A critical review of the available experimental data on Stark widths and shifts for spectral lines of nonhydrogenic neutral atoms and positive ions has been carried out. The review covers the period from 1989 through the end of 2000 and represents a continuation of earlier critical reviews up to 1988. Data tables containing the selected experimental Stark broadening parameters are presented with estimated accuracies. Guidelines for the accuracy estimates, developed during the previous reviews, are summarized again. The data are arranged according to elements and spectra, and these are presented in alphabetical and numerical order, respectively. A total of 77 spectra are covered, and the material on multiply charged ions has significantly increased. Comparisons with comprehensive calculations based on semiclassical theory are made whenever possible, since the comparison with theory has often been a principal motivation for the experiments.

A critical compilation of atomic transition probabilities for singly ionized argon

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.

Spectroscopic diagnostics of low temperature plasmas: techniques and required data

Abstract An overview of plasma diagnostic techniques based on atomic spectroscopy is given. Two widely used spectroscopic techniques-the Boltzmann-plot or slope method for excitation temperature measurements and Stark width determinations for electron density measurements-are discussed in detail. Since these techniques depend critically on the availability of accurate atomic data, especially transition probabilities and Stark broadening parameters, the numerical data are reviewed with respect to availability and quality. For the important spectra of Ar I and Fe I, tables of the most accurate transition probabilities-typically with uncertainties of ±10% or less-are given, which are based on very recent critical compilations. Some specific data needs are pointed out which would significantly contribute to improve the accuracy of the diagnostic techniques.

Advances in plasma broadening of atomic hydrogen

The Stark broadening tables for hydrogen Lyman, Balmer and Paschen lines published in the early seventies give accurate results for the widths of the β lines down to relatively low electron densities, and for the far line wings in general. However, the half-widths of the α lines can be in error by as much as a factor of 30, particularly at intermediate densities. Modern theoretical methods are capable of producing accurate values over the entire density range. Recent developments in the Stark broadening of non-hydrogenic species are also considered.

Regularities in Experimental Stark Shifts

Abstract We have examined regularities in plasma-produced line shifts (Stark shifts) by a comprehensive analysis of literature data. Since the shifts are the result of atomic collision processes, regularities are expected from general atomic structure considerations. Specifically, systematic behavior should occur for spectral series and for corresponding transitions in homologous atoms and isoelectronic ions. Also, Stark shifts should be similar for lines within multiplets and, to a lesser degree, within supermultiplets and transition arrays. Numerous examples show conclusively that the measured data exhibit these predicted regularities. When pronounced irregularities occur, they are readily explainable in terms of special circumstances in the atomic structure.

Progress and challenges in the determination of atomic transition probabilities

A brief review of advances in the determination of atomic transition probabilities during the last 20 years is given. Several frequently studied transitions are used as examples to indicate the remarkable advances in accuracy and consistency between independent results. Major developing trends and some challenges for the future are also briefly discussed.

Transition Probabilities for Prominent Ar i Lines in the Near Infrared

Relative transition probabilities of 81 infrared Ar i lines in the wavelength range from 9000–24 000 A have been measured with a wall-stabilized arc operating in argon at atmospheric pressure. The large majority of the lines from the 4p–5s and 4p–3d transition arrays has been observed and the measurements are consistent with the J-file-sum rule. The data have been normalized to an absolute scale by utilizing the results of other recent arc and lifetime experiments.

Spectral Data and Grotrian Diagrams for Highly Ionized Chromium, Cr v through Cr XXIV

Wavelengths, energy levels, ionization energies, line classifications, oscillator strengths, and atomic transition probabilities for Cr v to Cr XXIV are tabulated. A short review of the line identifications and wavelength measurements is given for each stage of ionization. Grotrian diagrams are given to provide graphical overviews. The literature has been surveyed through December 1991. §

Spectral Data and Grotrian Diagrams for Highly Ionized Cobalt, Co VIII through Co XXVII

Wavelengths, energy levels, level classifications, oscillator strengths, and atomic transition probabilities for the cobalt ions Co VIII to Co XXVII are tabulated. A short review is given for the wavelength measurements on each stage of ionization. Grotrian diagrams are also presented to provide graphical overviews. The literature has been surveyed to March 1990.

Spectral Data and Grotrian Diagrams for Highly Ionized Manganese, Mn VII through Mn XXV

Critically evaluated wavelengths, energy levels, ionization energies, line classifications, oscillator strengths, and atomic transition probabilities for Mn VII to Mn XXV are tabulated. A short review of the line identifications and wavelength measurements is given for each stage of ionization. Grotrian diagrams are also presented to provide graphical overviews. The literature has been surveyed to December 1991.