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IAU COMMISSION 14:
ATOMIC AND MOLECULAR DATA
(DONNEES ATOMIQUES ET MOLECULAIRES)
TRIENNIAL REPORT (OCTOBER 1999)
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|
WORKING GROUP 2: ATOMIC TRANSITION PROBABILITIES
PRESIDENT: W. L. WIESE
VICE-PRESIDENT: J. R. FUHR
The Data Center on Atomic Transition Probabilities at the National Institute
of Standards and Technology (NIST) Gaithersburg, MD 20899, USA is continuing
its critical data compilation and bibliographical work. It has contributed
all its evaluated transition probability material to a greatly expanded
version 2.0 of the NIST atomic spectroscopic database, which has now been
installed on the World Wide Web. This database contains about 50,000 transition
probabilities with estimated uncertainties and may be accessed via links
from the NIST Physics Laboratory WWW homepage at:
http://physics.nist.gov
Details on this and several other atomic spectroscopy databases on the
Internet are given in the report of Working Group 1. The comprehensive
NIST bibliographical database, which now contains more than 7000 entries,
has been updated through May 1999 and is also available at the above cited
World Wide Web site. The current compilation work of the NIST atomic transition
probabilities data center is centered on the evaluation and tabulation
of numerical data for the lighter elements. Work is in progress on hydrogen,
helium, lithium, beryllium, boron, fluorine, neon, sodium, magnesium, aluminum,
and silicon. The tabulations include allowed (electric dipole) as well
as forbidden (mainly magnetic dipole and electric quadrupole) lines.
Major tabulations of transition probability data during the period 1996
to the present are the following:
(a) The NIST data center published a 532-page volume of critically evaluated
transition probabilities for the three elements carbon, nitrogen and oxygen
as Monograph No. 7 of the Journal of Physical and Chemical Reference Data
[135]. This volume contains about 12,500 transitions for all 21 spectra
of these three elements.
(b) A large database for lines starting from the ground states of many
atoms and ions has been put on the World Wide Web by the University of
Kentucky "Atomic Data for Astrophysics" server (Verner et al.) [130]. Their
listings now contain 890,000 spectral lines, and for about 13 % of these,
transition probabilities are included, which are from the Opacity Project.
(c) A review of neutral atom oscillator strengths, published by Doidge
[47], in 1995, has been recently updated [48]. This compendium contains
oscillator strengths for atomic resonance lines of 65 elements and has
been collected mostly for the needs of laboratory atomic absorption spectroscopy.
(d) Morton [76] has prepared a new compilation containing transition probabilities
for resonance lines of heavier elements (Ge-Bi, plus limited data for Tc,
Th and U). These data are scheduled to be published in the Astrophysical
Journal, Supplement Series, as well as on a website.
The following theoretical and experimental projects have been especially
active and have contributed many new numerical data during the last three
years:
(a) Large amounts of data have been calculated as part of the Opacity Project
and its successor, the Iron Project. In particular, very extensive calculations
of transition probabilities for various ions of iron have been undertaken
[8, 9, 83, 84].
(b) Raassen and co-workers [102-106, 127] have calculated large quantities
of oscillator strengths for ionized atoms of the iron group elements by
using the "orthogonal operator" approach. Comparisons with experiments
indicate that the results are quite accurate. The data are available on
the World Wide Web at:
http://www.wins.uva.nl/research/atom/levels/levtext.html
(c) Lawler and co-workers [5, 10, 11, 37, 39, 77-79, 88, 132-134] have
measured numerous transition probabilities of neutral and singly ionized
atoms of the Fe-group as well as of several other heavier elements by a
combined branching ratio-lifetime technique.
Finally, it is of interest to note that a number of informative
review articles on the status and accuracy of oscillator strength data
were given at the 6th International Colloquium on Atomic Spectra and Oscillator
Strengths for Astrophysical and Laboratory Plasmas (ASOS 6), the proceedings
of which are in preparation (see Wiese and Morton) [136].
The remaining part of this report is a bibliography of selected recent
literature references, which contain new transition probability data of
astrophysical interest produced during the last three-year period. Thus,
this new selected bibliography continues where the last working group report
left off. As in the previous reports, the bibliographical material is ordered
with respect to element and stage of ionization. Table 1 provides an overview
of the bibliographical data by spectrum. The references are identified
by a running number, which refers to the general reference list at the
end of this report. In the general reference list the literature is ordered
alphabetically according to the first author, and each reference contains
one or more code letters indicating the method applied by the authors.
These code letters are defined as follows:
THEORETICAL METHODS:
Q - quantum mechanical calculations
EXPERIMENTAL METHODS:
E - measurements in emission (arc, hollow cathode, etc.).
A - measurements in absorption (absorption tube, etc.).
L - lifetime measurements (laser induced fluorescence, beam-laser and
beam-foil spectroscopy, etc.).
M - miscellaneous experimental methods (for example, Stark effect,
astrophysical measurements, etc.).
OTHER:
R - relative values only
F - forbidden transitions (not electric dipole)
CP - data compilations
CM - comments
Table 1. Important Literature References
| Ar I: 3,43 |
Gd I: 75 |
Pt II: 66 |
| Ar II: 6,91,123 |
|
|
| |
Ge I: 22 |
Rb I: 131 |
| As II: 23 |
Ge II: 23 |
|
| |
|
Re II: 132 |
| Au II: 69 |
He I: 51 |
|
| |
|
S I: 13,20,25,36,119,122 |
| B I: 57,62 |
Hg III: 69 |
S II: 82,109,120 |
| B II: 54,55,63,68 |
|
S III: 34,121 |
| |
K I: 131 |
S VII: 65 |
| Ba I: 74 |
|
S XII: 57 |
| |
Kr II: 41 |
|
| Be I: 55 |
|
Se II: 23 |
| |
Li I: 131 |
|
| Bi I: 24 |
|
Si II: 80 |
| Bi II: 24,60 |
Lu II: 27 |
Si III: 33 |
| Bi III: 24 |
|
Si V: 126 |
| |
Mg VIII: 57 |
Si VII: 38,64,124 |
| C I: 62,89,139 |
|
Si IX: 64,124 |
| C II: 57,62,85 |
Mn III: 127 |
Si X: 57 |
| C III: 12,46,54,55,85 |
|
|
| |
N I: 108 |
Sr II: 31 |
| Ca XV: 2 |
N II: 29,40,125,128 |
|
| |
N III: 57 |
Ti I: 88 |
| Ce III: 28 |
N IV: 55 |
Ti III: 104 |
| |
|
|
| Co II: 77,79,93,95,102,105 |
Na I: 131 |
Tl I: 3,24 |
| |
|
Tl II: 59 |
| Cr I: 37 |
Ne I: 117 |
Tl III: 61 |
| Cr II: 97 |
Ne II: 42,58 |
|
| |
|
Tm I: 5,134 |
| Cu II: 94 |
Ni I: 98,133 |
Tm II: 5,100,134 |
| |
Ni II: 52,98,138 |
|
| |
|
|
| Dy I: 39 |
Ni XIII: 16 |
V I: 90 |
| Dy II: 39 |
Ni XXIV: 57 |
V II: 70 |
| |
|
V IV: 104 |
| Er III: 137 |
O I: 32,81 |
|
| |
O II: 72,81,86,129 |
W I: 113 |
| Eu III: 110 |
O III: 1,53,81 |
|
| |
O IV: 30,57,81 |
Xe II: 67,73 |
| Fe I: 8,10,87,115 |
O V: 55,81 |
|
| Fe II: 10,11,21,49,50,78, |
O VI: 81 |
Y III: 31 |
| 99,103,105,114,116 |
O VII: 81 |
|
| Fe III: 83,106 |
|
Yb II: 19 |
| Fe IV: 9,56 |
Os IV: 112 |
|
| Fe VII: 35 |
Os V: 7 |
Zr II: 118 |
| Fe XI: 15,45 |
Os VI: 101 |
Zr III: 107 |
| Fe XII: 26 |
|
|
| Fe XV: 17,18,44 |
P I: 14 |
|
| Fe XXI: 2,92 |
|
|
| Fe XXII: 57 |
Pb I: 24 |
|
| Fe XXIV: 84 |
Pb II: 4 |
|
| Fe XXV: 84 |
|
|
| |
Pd II: 71,96 |
|
| Ga II: 111 |
|
|
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