Stuttgart 2012 – scientific programme

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A: Fachverband Atomphysik

A 21: Poster: Precision spectroscopy of atoms and ions

A 21.12: Poster

Tuesday, March 13, 2012, 16:30–19:00, Poster.V

Discovery of new Praseodymium I energy levels with help of green laser light — •Shamim Khan, Imran Siddiqui, Syed Tanweer Iqbal, and Laurentius Windholz — Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, A 8010 Graz, Austria

The hyperfine structure (hfs) of Praseodymium I spectral lines were experimentally investigated using LIF technique in a hollow cathode discharge lamp. We report here the investigation of 100 spectral lines which resulted in a discovery of 20 new energy levels of even and odd parity. The excitation source is a tunable ring-dye laser system, operated with Coumarin 102. The laser wavelength is tuned to a strong hyperfine component of the investigated spectral line, and fluorescence signals from excited levels are searched. The hfs of the investigated line is recorded by scanning the laser frequency across the investigated region. Magnetic hf interaction constant "A" and angular momentum "J" of the combining lower and upper levels involved in the formation of the line are evaluated. If one of the combining levels is not known (in most cases upper level), the determined angular momentum "J" and hyperfine constant "A" are used to identify one of the involved levels (in most cases the lower level) and the energy of the unknown level is determined by using center of gravity wave number of line and the energy of the identified level. The level found in this way must explain most of the observed fluorescence wavelengths and the hyperfine structure of the fluorescence lines appearing in FT spectrum [1].

[1] B. Gamper et al., J.Phys.B 44, 045003 (2011)