Polarization-dependent disappearance of a resonance signal: Indication for optical pumping in a storage ring? by 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

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