Abstract
For the determination of improved energy levels of ionic spectra of elements with large values of nuclear magnetic dipole moment (and eventually large values of nuclear quadrupole moments), it is necessary to determine the center of gravity of spectral lines from resolved hyperfine structure patterns appearing in highly resolved spectra. This is demonstrated on spectral lines of Ta II, Pr II and La II. Blend situations (different transitions with accidentally nearly the same wave number difference between the combining levels) must also be considered.
Highlights
The laser spectroscopy group at Graz University of Technology has been concerned since 1990 with investigations of the hyperfine structure of several elements
As a source of free atoms, a hollow cathode lamp was used in which a low-pressure plasma of the treated element was generated by cathode sputtering
A noble gas at a typical pressure of 0.5 mbar was used. This source of free atoms and ions was investigated by tunable laser light by scanning the laser frequency across the selected wavelength range
Summary
The laser spectroscopy group at Graz University of Technology has been concerned since 1990 with investigations of the hyperfine (hf) structure of several elements. During the procedure of line classification and cg wavelength determination, one is quite often even parity ionic states with energies above 72,000 cm−1 could be found, while the highest previously confronted with blend situations. With known hf constants of the four involved energy levels, it is possible to decompose the observed structure into two overlapping lines and to determine their cg wavelengths All available data on Pr energy levels (and of all other atoms of the lanthanide group) achieved remarkable progress in the classification of Pr I and Pr II lines She discovered a large were collected by Martin et al in 1978 [6]. In 2001, Investigations of the hf structure and search for new energy levels were performed by the Ivarsson et al. First results were published common paper [38], butrelevance.
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