Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 14: Poster: Precision spectroscopy of atoms and ions (with Q)
A 14.5: Poster
Monday, March 17, 2014, 16:30–18:30, Spree-Palais
Novel technique for precision spectroscopy of fast transitions: photon recoil detection — •Fabian Wolf, Yong Wan, Florian Gebert und Piet O. Schmidt — QUEST Institut, PTB Braunschweig und Universität Hannover
Quantum logic spectroscopy (QLS) has offered the possibility to investigate the electronic structure of many so far inaccessible species, but is limited to transitions involving a long-lived state. Photon recoil spectroscopy (PRS) is an extension of QLS to fast, dipole allowed transitions.
Here we present an absolute frequency measurement of the S1/2 → P1/2 transition of 40Ca+ using PRS with a co-trapped 25Mg+ logic ion. The axial mode of the two-ion-crystal is cooled to its motional ground state. Afterwards, the spectroscopy laser induces a detuning-dependent momentum transfer from photon recoil onto the spectroscopy ion that is detected on the logic ion via a red sideband STIRAP-like pulse. This method enables us to resolve the Ca transition to 1/300 of its observed linewidth with high accuracy and short averaging times. This renders PRS a powerful spectroscopic tool for the measurement of broad transitions. Due to its high sensitivity of only 10 absorbed photons for a SNR of 1, PRS is a promising technique for spectroscopy of transition that scatter only few photons.
The next step will be the implementation of a similar scheme for rotational state spectroscopy on a molecular ion. The current status of this experiments and simulations for rotational state preparation are presented as well.