EGAS41 - Swansea University

41 st EGAS CP 160 Gdańsk 2009
Investigation of the hyperfine structure of Pr I lines in the
region 5650 Å to 6200 Å
S. Tanweer Iqbal, S. Khan, I. Siddiqui, U. Zaheer, L. Windholz ∗
Institut für Experimentalphysik, Technische Universität Graz,
Petersgasse 16, A-8010 Graz, Austria
∗ Corresponding author: windholz@tugraz.at
Some unclassified spectral lines of the praseodymium (Pr) atom have been studied in the
region from 5650Å to 6200Å. The hyperfine structure of these lines has been recorded
by using the method of laser induced fluorescence in a hollow cathode discharge. During
this investigation, eighteen new energy levels have been discovered, eight energy levels
with odd parity and ten energy levels with even parity. The excitation sources are operated
with R6G or Kiton red ring-dye laser pumped by a solid state diode-pumped,
frequency doubled Nd:Vanadate Nd:YVO4 Verdi V-18 laser system. J-quantum numbers
and magnetic dipole interaction constant A-values for upper and lower levels have been
determined from the recorded hyperfine structure. The energies of new levels have been
obtained by using these constants, excitation and fluorescence wavelengths. The excitation
wavelengths have been taken from FT Spectra [1]. Levels confirmed by a second laser
excitation are given in the following table.
Involved new energy levels
Excitation Signal/Noise Angular Magnetic Electric Energy
Wavelength in FT Momentum Hyperfine Parity in
(λ air ) in Å Spectra J Constants in MHz cm −1
1 5771.190 2 4.5 724(5) 0 e 29053.279
2 5665.975 9 5.5 689(5) 0 e 30465.398
3 5702.252 9 6.5 594(5) 54(13) e 29278.391
4 5711.383 6 4.5 526(5) 16(6) e 31506.346
5 5836.392 6 5.5 1138(5) -21(4) o 28313.518
6 5763.901 23 3.5 720(5) 0 o 28264.931
7 5660.990 6 6.5 729(5) 0 o 27334.913
8 5701.444 3 6.5 555(5) 0 o 32772.692
9 5824.037 4 6.5 596(5) 0 e 32512.894
10 5751.203 6 7.5 720(5) 0 o 30850.357
11 5797.194 4 4.5 509(5) 19(4) o 31713.229
12 5798.548 6 7.5 460(5) 38(13) e 30242.931
13 5683.636 9 6.5 581(5) 68(23) e 29335.783
14 5992.673 12 3.5 679(5) 0 e 27336.533
15 5909.890 8 6.5 589(5) 33(6) e 28238.556
16 5751.219 9 5.5 734(5) 0 o 26026.641
17 6144.727 21 5.5 556(5) 0 e 24519.756
18 6161.215 5 2.5 938(5) 0 o 26144.279
References
[1] B. Gamper, Diploma Thesis, Technische Universität Graz, 2007 (unpublished)
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