Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 37: Precision Spectroscopy of Atoms and Ions VII

A 37.2: Fachvortrag

Freitag, 6. März 2009, 14:30–15:00, VMP 6 HS-B

Optical Hyperfine Structure and Isotope Shift Measurements on Os⁻ — •Arne Fischer, Carlo Canali, Ulrich Warring, and Alban Kellerbauer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

In 1999 the first bound–bound electric-dipole transition in a negative ion was observed in the transition metal osmium. Within the UNIC project (Ultracold Negative Ions by indirect laser Cooling) we studied this transition and performed measurements of the isotope shift for all naturally occurring isotopes and the hyperfine structure in ¹⁸⁷Os⁻ and ¹⁸⁹Os⁻. The hyperfine constants of the ground and the bound excited state of ¹⁸⁷Os⁻ and ¹⁸⁹Os⁻ were determined. For the spectroscopy a mass-separated beam of negative osmium ions was collinearly superimposed with a tunable narrow-bandwidth laser. Due to the velocity-bunching effect in a fast beam this geometry allows precise measurents with linewidths of some MHz and hence sufficient resolving power to resolve the hyperfine structure.