Experimental Investigation of the Hyperfine Structure and Theoretical Studies of the Even Configurations of Sc I

Optogalvanic laser spectroscopy has been applied to measure the hyperfine structure of 13 spectral lines of Sc I in the wavelength range from 645 to 780 nm. Experimental magnetic dipole hyperfine structure constants A of the isotope ⁴⁵Sc have been determined for three levels of even and ten levels of odd parity. For six of these levels the A constants have been measured for the first time. For two further levels the A constants have already been measured but discrepancies between our values and the previous ones are found and discussed. With the new experimental results a parametric analysis of the magnetic dipole hyperfine structure has been performed for the even configuration 3d²4s and a very high value for the contact parameter a_3d¹⁰ has been found. Additionally, the experimental results for the other even levels are discussed.