Hamburg 2009 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Precision Spectroscopy of Atoms and Ions V
A 30.1: Fachvortrag
Donnerstag, 5. März 2009, 16:30–17:00, VMP 6 HS-B
Accurate absolute frequency and isotope shift measurements of the 3s-3p doublet in 24−26Mg+ — •Valentin Batteiger1, Sebastian Knünz1, Maximilian Herrmann1, Guido Saathoff1, Thomas Udem1, and Theodor W. Hänsch1,2 — 1Max–Planck–Institut für Quantenoptik, 85748 Garching, Germany — 2Ludwig–Maximilians–Universität München, 80539 München, Germany
We present an isotopically resolved absolute frequency measurement of both fine structure components of the 3s-3p transition near 280nm in Mg+. When red-shifted into the transparency range of our atmosphere, the doublet is frequently observed in astronomical spectra. Thus the transitions are good probes of physics at early epochs. Together with other strong UV transitions both lines where requested for improved measurement on the quest for a possible space-time variation of the fine structure constant 7-11 billion years ago. We performed a series of absolute frequency measurements on single trapped magnesium ions. Owing to a new spectroscopy method we could improve the values of the transition frequencies, fine structure splitting and isotope shifts by more than two orders of magnitude.