Eur. Phys. J. D (2014) 68: 122
https://doi.org/10.1140/epjd/e2014-50025-7

Regular Article

Experimental investigation of the hyperfine spectra of Pr I-lines: Discovery of new fine structure levels with high angular momentum^*

¹ Institut für Experimentalphysik, Technische Universität Graz, Petersgasse 16, 8010 Graz, Austria
² Department of Physics, University of Karachi, 75270 Karachi, Pakistan
³ Department of Physics, Islamia College Peshawar, Peshawar, Pakistan

^a e-mail: windholz@tugraz.at

Received: 10 January 2014
Received in final form: 14 March 2014
Published online: 15 May 2014

Abstract

We present 66 even and 58 odd parity newly discovered fine structure levels of Pr I with high angular momentum: J = 15/2, 17/2 and 19/2 and 21/2. Spectral lines in the range 4200 Å to 7500 Å were experimentally investigated using laser induced fluorescence spectroscopy in a hollow cathode discharge lamp. The levels were discovered by analysis of the recorded hyperfine patterns of the investigated transitions. More than 800 spectral lines could be classified with help of these levels.