Discovery of new even-parity fine structure levels of Pr I with angular momenta 1/2, 3/2, and 5/2

Imran Siddiqui*, Khan Shamim, Syed Tanweer Iqbal, L. Windholz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The spectrum of Praseodymium was investigated in the visible region from 4000 Å to 7500 Å based on previously recorded Fourier Transform spectra. Source of free Pr atoms was a hollow cathode discharge lamp. The investigation of spectral lines was performed using laser-induced fluorescence spectroscopy. A tunable single mode ring-dye laser, pumped by a frequency doubled Nd-YAG laser, was used as the light source to investigate selected lines. Hyperfine spectra of 129 lines were recorded and the magnetic dipole hyperfine structure constants of the involved energy levels were determined. This led to the discovery of up to now unknown levels. In this paper, 30 even parity levels, having J-values of 1/2, 3/2, and 5/2 are presented. The existence of all levels is confirmed by several laser excitations in the spectral range of our dye lase
Original languageEnglish
Article number107619
Number of pages10
JournalJournal of Quantitative Spectroscopy & Radiative Transfer
Publication statusPublished - Jun 2021


  • Hollow cathode lamp
  • Hyperfine structure
  • Laser-induced fluorescence
  • New energy levels
  • Praseodymium

ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

Fields of Expertise

  • Sonstiges


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