The hyperfine structure splittings (hfs) and isotope shifts (IS) in the atomic transitions 5s 2 5p 2 ~So ~5s 2 5p6s 1.3p~ have been measured for the radioactive isotopes lo8 ~l~Sn and all stable ones. The tin isotopes were prepared as fast atomic beams for collinear laser spectroscopy at the GSI online mass separator following a fusion reaction. Nuclear spins, magnetic dipole, electric quadrupole moments and changes in mean square charge radii have been determined. In a~ the spin I=5/2 was measured for the nuclear ground state (Tt/2= 18 min) in contradiction to the literature value. The mean square charge radii show a parabolic behaviour with a maximum at N = 66. This is interpreted by collective effects, which are considerably stronger than accounted for by the B(E2)values.

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Collinear fast beam laser spectroscopy has been used to measure the hyperfine structure and isotope shift in the atomic 5s 2 5p2p3/2-5s26s2S1/2 transition (2=451nm) of 1~Secondary beams of neutron deficient indium isotopes were prepared at the GSI on-line mass separator following fusion evaporation reactions. Magnetic dipole moments and electric quadrupole moments have been determined. The isotope shifts are discussed in terms of the change of the mean square nuclear charge radii and compared with the droplet model predictions and the deformation values calculated from the quadrupole moments.

Two-photon laser spectroscopy in a dense indium vapour allowed to investigate np 2P~/2,3/2 states (n=27-35) for ~3, ~15in with a thermionic diode. Precise data on the fine structure splitting of these states and the isotope shift of the two photon transitions have been obtained. The fine structure splitting shows a hydrogenic behaviour. By using the result of our isotope shift measurement in combination with literature values, level isotope shifts with reference to the ionization limit are deduced and analysed with respect to the different contributions.