Messung der Hyperfeinstrukturaufspaltung des⁴F_9/2-Grundzustandes im Co⁵⁹-I-Spektrum und Bestimmung des Quadrupolmomentes des Co⁵⁹-Kernes

Abstract

The hyperfine structure splittings of the electronic ground statea ⁴ F _9/2 in the Co⁵⁹-I-spectrum have been measured with a magnetic atomic-beam resonance-apparatus. From these splittings the magnetic dipole and electric quadrupole interaction constants are found to beA (a ⁴ F _/2)=(450,284±0,01) Mc/sec,B (a ⁴ F _9/2)= (139,63±0,5) Mc/sec. Taking into account the mixture of thea ⁴ F _9/2 state with states of the same 3d ⁷ 4s ²-electron-configuration, an electric quadrupole moment of Co⁵⁹ ofQ=(0,404±0,04) 10⁻²⁴ cm² was obtained. No Sternheimer-correction has been included.