Three-photon resonance ionization of atomic Mn in a hot-cavity laser ion source using Ti:sapphire lasers
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division
- Johannes Gutenberg Univ., Mainz (Germany). Dept. of Physics
We have demonstrated three-photon resonance ionization of atomic manganese (Mn) in a hot-cavity ion source using Ti: sapphire lasers. Three-step ionization schemes employing different intermediate levels and Rydberg or autoionizing (AI) states in the final ionization step are established. Strong AI resonances were observed via the 3d54s5s f6S5/2 level at 49 415.35 cm-1, while Rydberg transitions were reached from the 3d54s4d e 6D9/2,7/2,5/2) levels at around 47 210 cm-1. Analyses of the strong Rydberg transitions associated with the 3d54s4d e 6D7/2 lower level indicate that they belong to the dipole-allowed 4d → nf6F°9/2,7/2,5/2 series converging to the 3d54s 7S3 ground state of Mn II. From this series, an ionization potential of 59 959.56 ± 0.01 cm-1 is obtained for Mn. At high ion source temperatures the semi-forbidden 4d → nf8F°9/2,7/2,5/2 series was also observed. The overall ionization efficiency for Mn has been measured to be about 0.9% when using the strong AI transition in the third excitation step and 0.3% when employing an intense Rydberg transition. Experimental data indicate that the ionization efficiency was limited by the interaction of Mn atoms with ion source materials at high temperatures.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP); German Federal Ministry of Education and Research (BMBF)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1261435
- Journal Information:
- Journal of Physics. B, Atomic, Molecular and Optical Physics, Vol. 48, Issue 11; ISSN 0953-4075
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
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