ISOTOPE SHIFTS AND HYPERFINE-STRUCTURE IN THE 3D-D-2(J)-]4P-P-2(J) TRANSITIONS IN CALCIUM II

The isotope shift and hyperfine structure in the three 3d D-2(3/2,5/2) --> 4P P-2(1/2,3/2) - transitions in Ca II have been studied by fast ion beam collinear laser spectroscopy for all stable Ca isotopes. The metastable 3d states were populated within the surface ionization sour ce of a mass separator with a probability of about 0.1%. After resonan t excitation to the 4p levels with diode laser light around 850 nm the uv photons from the 4p --> 4s transitions to the ground state were us ed for detection. Hyperfine structure parameters A and B ibr the odd i sotope Ca-43, as evaluated from the splittings observed, agree well wi th theoretical predictions from relativistic many-body perturbation th eory. Field shift constants K-FS and specific mass shift constants K-S MS were extracted from tile measured isotope shifts and are discussed in comparison with expectation values from theory.