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Dielectronic recombination of lithium-like Ni25+ ions - high resolution rate coefficients and influence of external crossed E and B fields | | Stefan Schippers
; Timo Bartsch
; Carsten Brandau
; Alfred Mueller
; Gerald Gwinner
; Goetz Wissler
; Michael Beutelspacher
; Manfred Grieser
; Andreas Wolf
; Ronal Phaneuf
; | | Date: |
19 Feb 2000 | | Journal: | Phys. Rev. A 62, 022708 (2000). | | Subject: | Atomic Physics; Plasma Physics | physics.atom-ph astro-ph physics.plasm-ph | | Abstract: | Absolute dielectronic recombination (DR) rates for lithium-like Ni$^{25+}$($1s^2 2s$) ions were measured at high-energy resolution at the Heidelberg heavy-ion storage ring TSR. We studied the center-of-mass energy range 0--130 eV which covers all $Delta n$=0 core excitations. The influence of external crossed electric (0--300 V/cm) and magnetic (41.8--80.1 mT) fields was investigated. For the measurement at near-zero electric field resonance energies and strengths are given for Rydberg levels up to n$=$32; also Maxwellian plasma rate coefficients for the $Delta n$=0 DR at electron temperatures between 0.5 and 200 eV are provided. For increasing electric field strength we find that for both the $2p_{1/2}$ and the $2p_{3/2}$ series of Ni$^{24+}$($1s^2 2p_j nell$) Rydberg resonances with n>30 the DR rate coefficient increases approximately linearly by up to a factor of 1.5. The relative increase due to the applied electric field for Ni$^{25+}$ is remarkably lower than that found in previous measurements with lighter isoelectronic Si$^{11+}$, Cl$^{14+}$ and also Ti$^{19+}$ ions, [T. Bartsch et al, Phys. Rev. Lett. {f 79}, 2233 (1997); {f 82}, 3779 (1999) and to be published] and in contrast to the results for lighter ions no clear dependence of the electric field enhancement on the magnetic field strength is found. The Maxwellian plasma rate coefficients for $Delta n$=0 DR of Ni$^{25+}$ are enhanced by at most 11% in the presence of the strongest experimentally applied fields. | | Source: | arXiv, physics/0002036 | | Services: | Forum | Review | PDF | Favorites | |
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