dorsal/arxiv
View SchemaDielectronic recombination of lithium-like Ni25+ ions - high resolution rate coefficients and influence of external crossed E and B fields
| Authors | Stefan Schippers, Timo Bartsch, Carsten Brandau, Alfred Mueller, Gerald Gwinner, Goetz Wissler, Michael Beutelspacher, Manfred Grieser, Andreas Wolf, Ronal Phaneuf |
|---|---|
| Categories | |
| ArXiv ID | physics/0002036 |
| URL | https://arxiv.org/abs/physics/0002036 |
| DOI | 10.1103/PhysRevA.62.022708 |
| Journal | Phys. Rev. A 62, 022708 (2000). |
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$^{24+}$($1s^2 2p_j n\ell$) 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. {\bf 79}, 2233 (1997); {\bf 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.
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"abstract": "Absolute dielectronic recombination (DR) rates for lithium-like\nNi$^{25+}$($1s^2 2s$) ions were measured at high-energy resolution at the\nHeidelberg heavy-ion storage ring TSR. We studied the center-of-mass energy\nrange 0--130 eV which covers all $\\Delta n$=0 core excitations. The influence\nof external crossed electric (0--300 V/cm) and magnetic (41.8--80.1 mT) fields\nwas investigated. For the measurement at near-zero electric field resonance\nenergies and strengths are given for Rydberg levels up to n$=$32; also\nMaxwellian plasma rate coefficients for the $\\Delta n$=0 DR at electron\ntemperatures between 0.5 and 200 eV are provided. For increasing electric field\nstrength we find that for both the $2p_{1/2}$ and the $2p_{3/2}$ series of\nNi$^{24+}$($1s^2 2p_j n\\ell$) Rydberg resonances with n\u003e30 the DR rate\ncoefficient increases approximately linearly by up to a factor of 1.5. The\nrelative increase due to the applied electric field for Ni$^{25+}$ is\nremarkably lower than that found in previous measurements with lighter\nisoelectronic Si$^{11+}$, Cl$^{14+}$ and also Ti$^{19+}$ ions, [T. Bartsch et\nal, Phys. Rev. Lett. {\\bf 79}, 2233 (1997); {\\bf 82}, 3779 (1999) and to be\npublished] and in contrast to the results for lighter ions no clear dependence\nof the electric field enhancement on the magnetic field strength is found. The\nMaxwellian plasma rate coefficients for $\\Delta n$=0 DR of Ni$^{25+}$ are\nenhanced by at most 11% in the presence of the strongest experimentally applied\nfields.",
"arxiv_id": "physics/0002036",
"authors": [
"Stefan Schippers",
"Timo Bartsch",
"Carsten Brandau",
"Alfred Mueller",
"Gerald Gwinner",
"Goetz Wissler",
"Michael Beutelspacher",
"Manfred Grieser",
"Andreas Wolf",
"Ronal Phaneuf"
],
"categories": [
"physics.atom-ph",
"astro-ph",
"physics.plasm-ph"
],
"doi": "10.1103/PhysRevA.62.022708",
"journal_ref": "Phys. Rev. A 62, 022708 (2000).",
"title": "Dielectronic recombination of lithium-like Ni25+ ions - high resolution rate coefficients and influence of external crossed E and B fields",
"url": "https://arxiv.org/abs/physics/0002036"
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