IAU COMMISSION 14: ATOMIC AND MOLECULAR DATA (DONNEES ATOMIQUES ET MOLECULAIRES) TRIENNIAL REPORT (OCTOBER 1999)

WORKING GROUP 1: ATOMIC SPECTRA AND WAVELENGTH STANDARDS

1.1. Energy Level Analyses, Wavelengths and Line Classifications

The references cited in this section are mostly papers on original laboratory research; compilations and data bases are covered in another section. The references, ordered by atomic number and spectrum, are given in parentheses following the spectral notations. They are designated by the first letter of the first author's last name and a serial number; these designations precede the full citations in the reference list at the end of the report.

Be I (K9), Be II (K8), B II (L2), B III (L1), C I (C2), C IV (T2), O VII (B1), F II (B5) , Ne III (L3), Ne IV (B2, C4), Ne V (B3), Mg I, II (P7), Al I (B6), Si VII (K5), Si VIII (K7), S IX (J2), S X (K7), Ar III (K4), Ar V (C1), Ar VII (T1), Sc X- Fe XV (K6), V I (P1), Cr III (E1), Mn VII (W3), Fe II (B4, B7, N1), Fe VIII (W4), Co I (P3), Co II (P4, P5, P6), Co IX (W5), As III, IV (C3), Kr III (R4), Zr III (R1), Zr IV (R2), Nb III (G1), Mo I (P2), Pd I (E3, M1), Ba I,II (K3), Ce III (W6), Dy III (S1), Ho I (K10), Er III (W7), W II (E2), Re II (W1), Os IV (R6), Pt II (K1), Au II (R5), Hg II (R3), Tl II (J1), Pb II (K2), Bi I, II, III (W2)

The references for elements heavier than Ni (Z>28) are limited to the first three or four spectra only, these data being of interest for solar and stellar spectroscopy. The references of the lighter elements are also incomplete, the selection being limited to those of highest astrophysical interest. The data in a number of references include and/or supersede all or most of the previously available energy-level and/or wavelength data for the indicated spectrum. Such references include those of Be I, Si VII, S IX, Ar III, Ar VII, Cr III, Co I, Co II (P5), Zr III, Zr IV, Nb III, Pd I, Ba I, Ba II, Dy III, Er III, W II, Os IV, and Au II. For elements heavier than Ga new and unpublished data will be included in the new compilation by Morton (1999) on atomic data for resonance absorption lines.

Current work in high-resolution laboratory spectroscopy of the lowest ionization stages of astrophysical significance is ongoing at Lund (mainly transition elements and rare earth elements), London (third spectra of iron group elements), and NIST (heavy elements, rare earths). The spectroscopy groups at Troitsk (Russia), Amsterdam (NL), Antogonish (CA), Meudon and Orsay (FR) have announced a project on spectroscopy of ions of the 5d elements (The Platinum Group Ion project), in addition to other projects in progress.
 

1.2. Wavelength Standards

The paper by Nave et al. (1997) on accurate Fe II wavelengths in the vacuum-ultraviolet region was discussed in the previous report by W.C. Martin. It has now been published and is mentioned here only for giving complementary information about the reference. A new campaign for very accurate wavelengths of selected lines has been initiated by the current work on the time variability of the fine structure constant (Webb et al. 1999). The data will certainly be of great interest for spectroscopy of the interstellar medium. The measurements will be carried out at London and Lund, and one paper has already been published for magnesium (Pickering et al. 1998).
 

1.3. Larger Compilations, Reviews, Conference Proceedings

We will mention a few compilations that have appeared during the period 1996-99, as most data are now available in various databases via Internet; some databases are listed in the next section. Kramida and Martin (1997) have compiled the Be I spectrum, and Shirai, Sugar and Musgrove (1999) have submitted a compilation on Ga I-Ga XXXII. Compilations on Highly Ionized Atoms (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Kr, Mo), on the Ne I spectrum and for all Argon spectra are in preparation in collaborations between NIST, Japan Atomic Energy research Institute and the Institute for Spectroscopy in Troitsk, Russia. At the latter institute compilations of various ionization stages of neon are completed or in progress. Morton (1999) has submitted a compilation of Atomic Data for Resonance Absorption Lines. II. Wavelengths Longward of the Lyman Limit for Heavy Elements.

A number of papers on atomic spectroscopic data are included in proceedings of the Sixth International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas, held in Victoria, Canada, August 1998. Invited papers are scheduled for publication (Wiese et al. 1999), and abstracts of contributed papers appear in a publication of the University of Columbia (Tatum 1999). A few papers on astrophysical data needs are included in the proceedings from the first international conference ICAMDATA (International Conference on Atomic and Molecular Data and Their Applications), held at NIST, Gaithersburg, U.S.A., October 1997 (Mohr \& Wiese 1998). Several papers deal with atomic databases. The proceedings of poster papers (Wiese & Mohr 1998) contain papers about spectroscopic data for astrophysics.
 

1.4. Atomic Spectroscopic Data on the Internet

The URL addresses for a number of World Wide Web sites offering laboratory data of the types covered by Working Groups 1 and 2 are listed below. The italicized names of particular databases or datasets are followed by symbols CL, El, TP in parentheses, indicating types of data:

The NIST Atomic Spectra Database version 2.0, released in March 1999, includes data (Cl, EL, TP) that have been critically compiled either at NIST or by other reliable sources.

Spectral information can be obtained at CDS (Centre de Donnes Astronomiques de Strasbourg, France) and the ADC, Astronomical Data Center at NASA Goddard Space Flight Center, U.S.A.

Theoretical data (EL,TP) on selected ions of the elements, Cr, Mn, Fe, Co and Ni are available via ftp from "Atomic Physics Theory" at the University of Amsterdam.

The compilation of "Atomic Data for Resonance Absorption Lines" at Herzberg Institute of Astrophysics, Canada, (Morton, 1991) is located at

The Atomic Data for Astrophysics (University of Kentucky, U.S.A.) has a database on "Energy Levels, Wavelengths, Transition Probabilities" (CL, TP) and a number of links to other databases and datasets.

References