Photorecombination of berylliumlike Ti18+: Hyperfine quenching of dielectronic resonances

Abstract

The photorecombination spectrum of 48Ti18+ was measured employing the merged electron-ion beams technique at a heavy-ion storage ring. The experimental electron-ion collision energy range 0-80 eV comprises all dielectronic recombination (DR) resonances associated with 2s->2p (Delta N =0) core excitations as well as trielectronic recombination (TR) resonances that involve 2s2->2p2 core double-excitations. At low collision energies DR resonances are observed that are associated with the excitation of metastable 2s2p 3P0 primary ions with nearly infinite lifetime for the isotope 48Ti with zero nuclear spin. For the isotope 47Ti with nonzero nuclear spin hyperfine quenching of these resonances occurs. The procedure for obtaining the associated time constant from a recombination measurement is outlined.

4 pages, 2 figures, procceedings of the 13th International Conference on the Physics of Highly Charged ions, 28.8-1.9.2006, Belfast, Northern Ireland, submited to J. Phys. Conf. Ser

References in corpus (3)

• Properties of metastable alkaline-earth-metal atoms calculated using an accurate effective core potential
• Hyperfine quenching of the metastable ${}^3{P}_{0,2}$ states in divalent atoms
• ${}^{12}$C/${}^{13}$C ratio in planetary nebulae from the IUE archives

Cited by in corpus (3)

• Storage-ring measurement of the hyperfine-induced 2s 2p 3P0 -> 2s2 1S0 transition rate in beryllium-like sulfur
• Relativistic, QED and nuclear effects in highly charged ions revealed by resonant electron-ion recombination in storage rings
• Absolute rate coefficients for photorecombination of berylliumlike and boronlike silicon ions