Polarization-dependent disappearance of a resonance signal: Indication for optical pumping in a storage ring?,Physical Review Accelerators and Beams

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Polarization-dependent disappearance of a resonance signal: Indication for optical pumping in a storage ring?
Physical Review Accelerators and Beams ( IF 1.7 ) Pub Date : 2021-02-04 , DOI: 10.1103/physrevaccelbeams.24.024701
W. Nörtershäuser , A. Surzhykov , R. Sánchez , B. Botermann , G. Gwinner , G. Huber , S. Karpuk , T. Kühl , C. Novotny , S. Reinhardt , G. Saathoff , T. Stöhlker , A. Wolf

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

2 s {{}^{3}S}_{1} (F = 3 / 2) \leftrightarrow 2 p {{}^{3}P}_{2} (F = 5 / 2) \leftrightarrow 2 s {{}^{3}S}_{1} (F = 5 / 2)

Λ

-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.

更新日期：2021-02-04

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