6533b820fe1ef96bd127a690
RESEARCH PRODUCT
Polarization-Dependent Disappearance of a Resonance Signal -- Indication for Optical Pumping in a Storage Ring?
T. KuhlB. BotermannSergei KarpukGerald GwinnerThomas StöhlkerC. NovotnyGuido SaathoffS. ReinhardtWilfried NörtershäuserRodolfo SánchezAndrey SurzhykovAndrey SurzhykovG. HuberAndreas Wolfsubject
Accelerator Physics (physics.acc-ph)Nuclear and High Energy PhysicsPhysics and Astronomy (miscellaneous)Atomic Physics (physics.atom-ph)FOS: Physical sciences53001 natural sciencesIonlaw.inventionPhysics - Atomic PhysicsOptical pumpinglaw0103 physical scienceslcsh:Nuclear and particle physics. Atomic energy. Radioactivityddc:530010306 general physicsCircular polarizationPhysics010308 nuclear & particles physicsSurfaces and InterfacesLaserPolarization (waves)FluorescenceDark statelcsh:QC770-798Physics - Accelerator PhysicsAtomic physicsStorage ringdescription
We report on laser spectroscopic measurements on Li$^+$ ions in the experimental storage ring ESR at the GSI Helmholtz Centre for Heavy Ion Research. Driving the $2s\,^3\!{S}_1\;(F=\frac{3}{2}) \,\leftrightarrow\,2p\,^3\!P_2\;(F=\frac{5}{2}) \leftrightarrow 2s\,^3\!{S}_1\;(F=\frac{5}{2})$ $\Lambda$-transition in $^7$Li$^+$ with two superimposed laser beams it was found that the use of circularly polarized light leads to a disappearance of the resonance structure in the fluorescence signal. This can be explained by optical pumping into a dark state of polarized ions. We present a detailed theoretical analysis of this process that supports the interpretation of optical pumping and demonstrates that the polarization induced by the laser light must then be at least partially maintained during the round trip of the ions in the storage ring. Such polarized ion beams in storage rings will provide opportunities for new experiments, especially on parity violation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-02-01 |