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Enhanced dielectronic recombination of lithium-like Ti19+ ions in external ExB fields

Timo Bartsch·Stefan Schippers·Michael Beutelspacher·Sebastian Boehm·Manfred Grieser·Gerald Gwinner·Amir A. Saghiri·Guido Saathoff·Reinhold Schuch·Dirk Schwalm·Andreas Wolf·Alfred Mueller
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Abstract

Dielectronic recombination(DR) of lithium-like Ti19+(1s2 2s) ions via 2s->2p core excitations has been measured at the Heidelberg heavy ion storage ring TSR. We find that not only external electric fields (0 <= Ey <= 280 V/cm) but also crossed magnetic fields (30 mT <= Bz <= 80 mT) influence the DR via high-n (2p_j nl)-Rydberg resonances. This result confirms our previous finding for isoelectronic Cl14+ ions [Bartsch T et al, PRL 82, 3779 (1999)] that experimentally established the sensitivity of DR to ExB fields. In the present investigation the larger 2p_{1/2}-2p_{3/2} fine structure splitting of Ti19+ allowed us to study separately the influence of external fields via the two series of Rydberg DR resonances attached to the 2s -> 2p_{1/2} and 2s -> 2p_{3/2} excitations of the Li-like core, extracting initial slopes and saturation fields of the enhancement. We find that for Ey > 80 V/cm the field induced enhancement is about 1.8 times stronger for the 2p_{3/2} series than for the 2p_{1/2} series.

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Timo Bartsch, Stefan Schippers, Michael Beutelspacher, Sebastian Boehm, Manfred Grieser, Gerald Gwinner, Amir A. Saghiri, Guido Saathoff, Reinhold Schuch, Dirk Schwalm, Andreas Wolf, Alfred Mueller. 2000-03-29. Enhanced dielectronic recombination of lithium-like Ti19+ ions in external ExB fields. https://doi.org/10.1088/0953-4075/33/12/106

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