Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 21: Poster: Precision spectroscopy of atoms and ions
A 21.20: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.V
Trapping of short lived Ra+ ions — •H. Bekker, M. Nunes Portela, D. Seelen, O. Dermois, K. Jungmann, C.J.G. Onderwater, R.G.E. Timmermans, L. Willmann, and H.W. Wilschut — KVI, University of Groningen, NL
A Precision measurement of atomic parity violation in order to determine electroweak mixing angle at low energy scale is underway at the KVI, University of Groningen. The experiment exploits the large sensitivity of a single trapped Ra+ ion. It requires the trapping of short lived radium ions in a Paul trap. Our first laser spectroscopy on an ensemble of trapped short-lived 209−214Ra+ isotopes employed buffer gas cooled ions in a linear Paul trap. It provided hyperfine structure of the 6d 2D3/2 states and isotope shift of the 6d 2D3/2-7p 2P1/2 transition [1,2]. In a next step the buffer gas cooled Ra ions are extracted from the trap and transported in an electrostatic transport system towards a small Paul trap in an UHV environment. Here the ion can be cooled and subsequently microwave transitions between hyperfine states in the 6d 2D3/2 manifold can be driven in order to yield high precision results on the hyperfine constants. These results provide input for the ongoing precision atomic structure calculations.
[1] O. O. Versolato et al. Phys. Lett. A 375 (2011) 3130-3133.
[2] G. S. Giri et al. Phys. Rev. A 84 (2011) 020503(R).