Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 17: Posters Friday (Spectroscopy)
A 17.25: Poster
Freitag, 6. April 2001, 12:30–15:00, AT3
Term analysis of Mo II — •Hampus Nilsson — Lund University, Box 118, 221 00 Lund, Sweden
The increased resolution and extended frequency region of astronomical spectra from modern observatories on ground and in space have set new requirements on the quality and availability of atomic data used in the analysis. In order to provide values of atomic parameters needed for a chemical analysis of a star, the energy level structure of atoms and ions has to be extensively known.
During the last twenty years an extensive laboratory program has been performed at Lund on the analysis of the level structure of singly ionized transition elements. Some elements show unexplained enhancements in their abundance in some stars. Such an element is molybdenum.
In this poster we present an extended analysis of Mo II, which has resulted
in about 100
new energy levels. The lowest levels of the previously unknown
configurations 4d35s2, 4d46s,
4d45d and 4d35s5p have been found. Some levels from the previous
analysis by Kiess
(1958) have been renamed and all but a few levels in that paper are
confirmed. Our results
are based on spectra recorded by Fourier transform spectrometers at Lund
University, Sweden,
and at Imperial College, London, UK, using hollow cathode and Penning
discharge lamps as light
sources. Along with this investigation of Mo II we report on other term
analyses of atomic
spectra that are in progress at Lund.
References
Kiess C C, 1958 J. Res. Nat. Bur. Std. 60, 375 RP2856