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

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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
Volume70
Issue number3
DOIs
Publication statusPublished - 1 Mar 2016

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laser induced fluorescence
quantum numbers
angular momentum
energy levels
fine structure
line spectra
optogalvanic spectroscopy
wavelengths
spectroscopy
hollow cathodes
excitation
parity
fluorescence
high resolution
atoms

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fields of Expertise

  • Sonstiges

Cite this

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title = "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",
abstract = "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 {\AA} to 7500 {\AA} 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.]",
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AU - Khan, Shamim

AU - Windholz, Laurentius

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AB - 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.]

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