Dielectronic Recombination of Na-Like S and Na-Like Ar in the Presence of External Fields

Details Dielectronic Recombination of Na-Like S and Na-Like Ar in the Presence of External Fields Dielectronic Recombination of Na-Like S and Na-Like Ar in the Presence of External Fields

Mar 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...694..354o&link_type=abstract

The Astrophysical Journal, Volume 694, Issue 1, pp. 354-358 (2009).

Astronomy and Astrophysics

Astronomy

1

Atomic Data, Atomic Processes, Magnetic Fields, Plasmas

Scientific paper

Recombination rate coefficients for two astrophysically relevant Na-like ions, S5+ and Ar7+, were derived from measurements at the electron cooler device of the CRYRING heavy-ion storage ring. Additionally, the enhancement of dielectronic recombination (DR) by external fields was studied for these ions. Motional electric fields were induced over the electron-ion interaction region by tilting the magnetic field that guides the electrons on the trajectory of the circulating ions. Field ionization at the dipole magnet prevented the detection of ions recombined into high Rydberg states. By comparing integrated areas of the recombination spectra over the field-affected range, enhancement factors of up to 1.9 and 2 were observed in the case of S5+ and Ar7+, for the maximum applied fields of ~184 V cm-1 and ~172 V cm-1, respectively. Saturation was not reached and at higher fields even higher enhancements are to be expected. Plasma DR rate coefficients were obtained from the experimental spectra recorded at different field strengths. For the highest applied fields, increasing enhancement of the plasma DR rates was found with higher temperatures, reaching up to ~42% and ~73% at 106 K, in the case of S5+ and Ar7+, respectively.

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