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Siddiqui, I., Shamim, K., Gamper, B., Dembczyński, J. and Windholz, L. (2013) Optogalvanic Spectroscopy of the Hyperfine Structure of Weak La I Lines: Discovery of New Even Parity Fine Structure Levels. Journal of Physics B, 46, 065002.
http://dx.doi.org/10.1088/0953-4075/46/6/065002

has been cited by the following article:

• TITLE: Variation of the Observed Widths of La I Lines with the Energy of the Upper Excited Levels, Demonstrated on Previously Unknown Energy Levels

  AUTHORS: L. Windholz, B. Gamper, T. Binder

  KEYWORDS: New Energy Levels of Lanthanum I, Hyperfine Structure, Line Widths

  JOURNAL NAME: Spectral Analysis Review, Vol.4 No.3, September 6, 2016

  ABSTRACT: We performed systematic laser spectroscopic investigations of La I spectral lines, using optogalvanic detection. Sixteen previously unknown even parity levels, having energies between 40,300 and 44,300 cm-1, are reported. These levels classify altogether 67 lines, not listed in spectral tables. The new levels were found due to the observation of the depopulation of the lower levels of the excited transitions. We found a remarkable variation of the observed widths of single hyperfine structure components dependent on the energy of the upper excited levels. Some levels having energies higher than 43,000 cm-1 appear to have a very high ionization probability.