Hannover 2010 – wissenschaftliches Programm
SYFC 1.4: Hauptvortrag
Montag, 8. März 2010, 15:30–16:00, A 001
Optical clocks with trapped ions and the search for variations of fundamental constants — •Ekkehard Peik — Physikalisch-Technische Bundesanstalt, 38116 Braunschweig
Optical clocks with laser-cooled trapped ions have now reached an accuracy that surpasses those of the best atomic clocks in the microwave domain. The comparison of different optical transition frequencies over time can be used in a laboratory search for a possible time dependence of the fine structure constant α. We investigate two reference transitions with very low natural linewidths that are promising candidates for precise clocks and also offer high sensitivity to variations of α: the electric octupole transition at 467 nm in 171Yb+ and the optical nuclear transition at about 7.6 eV in 229Th3+.