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A: Atomphysik

A 17: Posters Friday (Spectroscopy)

A 17.16: Poster

Freitag, 6. April 2001, 12:30–15:00, AT3

Fine structure analysis of Ta I by means of hyperfine structure investigations — •N. Jaritz¹, G.H. Guthöhrlein², J.C. Pickering³, and L. Windholz¹ — ¹Institut für Experimentalphysik, Technische Universität Graz, A-8010 Graz, Petersgasse 16 — ²Labor Für Experimentalphysik, FB Elektrotechnik, Universität der Bundeswehr Hamburg, D-22043 Hamburg, Holstenhofweg 85 — ³Lasp II, Blackett Laboratory, Imperial College, SW7 2BZ London, Prince Consort Rd.

The fact, that today for ca. 90% of the up to now known fine structure levels the hyperfine constants are known, makes it possible to check classifications and to classify lines. A computer program generates suggestions and shows the hyperfine structure to be expected. The calculated pattern can be compared with a highly resolved Fourier transform spectrum (absolute accuracy of the wavenumber position of the lines 0.002 cm⁻¹). The width of the lines (Doppler width and apparatus profile) is about 2 GHz, so in most cases the hyperfine structures are well resolved. Ta lines, which appear in the spectrum, but cannot be explained by the existing energy levels, are excited by laser light. Detection is performed by laser-induced fluorescence. From the observed hyperfine pattern and the wavelengths of excited and fluorescence lines the energy position, parity, total angular momentum and the hyperfine constants of new levels can be determined.