Berlin 2001 – wissenschaftliches Programm
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A: Atomphysik
A 17: Posters Friday (Spectroscopy)
A 17.17: Poster
Freitag, 6. April 2001, 12:30–15:00, AT3
Laser induced fluorescence spectroscopy and hyperfine structure evaluation - means for the classification of spectral lines in Pr I — •Hans-Otto Behrens, Marion Bette, and Günter H. Guthöhrlein — Laboratorium für Experimentalphysik, Universität der Bundeswehr Hamburg, Holstenhofweg 85, 22043 Hamburg
The search for and the identification of till now not yet found energy
levels
is performed by the classification of heretofore non-classified spectral
lines in
the praseodymium atomic spectrum. By laser induced fluorescence (LIF)
spectroscopy the
wavelengths of fluorescence transitions originating from a known excited
level are determined. The term values of the corresponding lower energy
levels of opposite parity of the fluorescence transitions are evaluated.
The range for the allowed J-values Jlower of these energy levels is
restricted due to the
selection rule for electric dipole radiation. Heretofore unknown energy
levels are identified.
The exact level energies, Jlower-values and hyperfine constants are
obtained by carefully evaluating the hyperfine structures of transitions of
these newly found energy levels to other already well known levels.
The classification procedure will be explained, the results of the
classification presented and compared with theoretical predictions of
semiempirical fine and hyperfine structure calculations performed in Orsay
[1] and Poznań [2].
Annie Ginibre: Physica Scripta 23, 260 (1981); Thèse, Orsay
1983
Jaroslav Ruczkowski, Ewa Stachowska: private communication