Abstract
This paper reports on resonance ionization scheme development for the production of exotic radium ion beams with the Resonance Ionization Laser Ion Source (RILIS) of the CERN-ISOLDE radioactive ion beam facility. During the study, autoionizing states of atomic radium were observed for the first time. Three ionization schemes were identified, originating from the 7s2 1S0 atomic ground state. The optimal of the identified ionization schemes involves five atomic transitions, four of which are induced by three resonantly tuned lasers. This is the first hot cavity RILIS ionization scheme to employ optical pumping effects. The details of the spectroscopic studies are described and the new ionization schemes are summarized.
Highlights
The principal ion source of the ISOLDE radioactive ion beam facility [1] based at CERN is the Resonance Ionization Laser Ion Source (RILIS) [2,3]
In this work we present the results of ionization scheme development for atomic radium including three new ionization schemes, the first identification of autoionizing states of atomic radium and the first harnessing of optical pumping effects within a hot cavity RILIS ionization scheme
The application of the ISOLDE RILIS was requested to enhance the yield of radium isotopes for an experiment [10] on the Collinear Resonance Ionization Spectroscopy (CRIS) beam line at ISOLDE [11]
Summary
The principal ion source of the ISOLDE radioactive ion beam facility [1] based at CERN is the Resonance Ionization Laser Ion Source (RILIS) [2,3]. The RILIS uses tunable lasers to excite valence electrons by targeting sequential atomic resonances before a final ionizing transition, typically either to an autoionizing state or non-resonant excitation to the ionization continuum. Excitation to an autoionizing state is typically the preferred method of ionization in resonance ionization spectroscopy (RIS) [4]. This is because the cross-section for a resonant transition can be orders of magnitude greater than for non-resonant excitation to the ionization continuum. In this work we present the results of ionization scheme development for atomic radium including three new ionization schemes, the first identification of autoionizing states of atomic radium and the first harnessing of optical pumping effects within a hot cavity RILIS ionization scheme
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