Hyperfine structure, spin, and isotope shift measurements have been performed on " "Rb and """"" Rb .The Rb nuclei have been produced either by spallation of Nb or by fission of U by a 600 MeV proton beam. They have been separated in mass before being transformed into a thermal atomic beam which interacts at a right angle with the light from a c.w. tunable dye laser. The charge radii changes deduced from the isotope shifts exhibit shell effects at N = 50 and deformations at N = 60, which are discussed.
NUCLEAR STRUCTURERb,~~~~~R bm. Measured hyperfine constants A(5s Sg/2), A(5P P3/2), B(5P P3/2); spins, isotope shifts. Deduced p, , Qs, 6 (r ). High resolution laser spectroscopy on thermal atomic beams.
The stability of multiply charged sodium clusters Na(q+)(n) (q< or =10) produced in collisions between neutral clusters and multiply charged ions A(z+) ( z = 1 to 28) is experimentally investigated. Multiply charged clusters are formed within a large range of temperatures and fissilities. They are identified by means of a high-resolution reflectron-type time-of-flight mass spectrometer (m/deltam approximately 14 000). The maximum fissility of stable clusters is obtained for z = 28 and is X approximately 0.85+/-0.07, slightly below the Rayleigh limit (X = 1). It is mainly limited by the initial cluster temperature (T approximately 100 K).
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