Experimental investigation of the hyperfine spectra of Pr I-lines: Discovery of new fine structure energy levels of Pr i using LIF spectroscopy with medium angular momentum quantum number between 7/2 and 13/2

Imran Siddiqui, Shamim Khan, Laurentius Windholz

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We present 39 even and 60 odd parity newly discovered fine structure levels of Pr I with angular momentum quantum numbers J = 7 / 2, 9/2, 11/2 and 13/2. Spectral lines in the wavelength range of 4200 Å to 7500 Å were investigated experimentally using laser-induced fluorescence spectroscopy or optogalvanic spectroscopy. Free Pr atoms were produced in a hollow cathode discharge. A high resolution Fourier transform spectrum of Pr was used to extract excitation wavelengths. From an analysis of the recorded hyperfine patterns, together with excitation and fluorescence wavelengths, we were able to find the unknown levels involved in the formation of the investigated lines. More than 500 spectral lines could be classified by the new levels. Graphical abstract: [Figure not available: see fulltext.]

Original languageEnglish
Article number44
JournalThe European physical journal / D
Issue number3
Publication statusPublished - 1 Mar 2016


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fields of Expertise

  • Sonstiges

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