Heidelberg 2015 – wissenschaftliches Programm
A 17.7: Vortrag
Dienstag, 24. März 2015, 16:00–16:15, P/H1
Precision isotope shift measurements of calcium ions using photon recoil amplification schemes — •F. Gebert1, Y. Wan1, J. C. Heip1, F. Wolf1, J. Berengut2, and P. O. Schmidt1,3 — 1QUEST Institut, Physikalisch-Technische Bundesanstalt, 38116 Braunschweig — 2School of Physics, University of New South Wales, Sydney — 3Institut für Quantenoptik, Leibniz Universität Hannover
We present isotope shift measurements of the 2D3/2-2P1/2 and 2S1/2-2P1/2 transitions in calcium ions using the photon recoil spectroscopy technique (PRS). In PRS, a spectroscopy ion is trapped and sympathetically cooled by a cooling ion. Photon recoil from absorption on a spectroscopy transition results in motional excitation probed by the cooling ion using quantum logic techniques. In a new approach single-photon repumping from the meta-stable 2D3/2 state via the 2D3/2-2P1/2 transition serves as the spectroscopy signal, which is efficiently translated into motion of the two ion crystal, through amplification via recoil from absorption of photons resonant with the 2S1/2-2P1/2 transition. The residual motional ground state population is then probed using a stimulated Raman adiabatic passage pulse driving a motional sideband on the 25Mg+ logic ion. We present isotope shift measurements using the new technique with an accuracy improved by up to two orders of magnitude. We performed a multidimensional King plot analysis and extracted important nuclear constants from the optical data.