Hyperfine structure of Mn II by fast ion beam-laser spectroscopy

We report the first measurements of the hyperfine splitting of the fine structure levels 3d5'4s a5S2 and 3d5 4p z5P 1,2,3 0 in singly ionised manganese in a collinear fast ion beam-laser experiment. The ions are excited by the intracavity frequency doubled output of a ring dye laser. The observed linewidth is sufficiently narrow to identify all hyperfine components of each fine structure level.