期刊
出版社
ELSEVIER
DOI: 10.1016/j.nimb.2012.08.023
关键词
Resonance ionization; Laser ion source; Laser repetition rate; Gas cell; Gas jet
类别
资金
- FWO-Vlaanderen (Belgium) [GOA/2010/010]
- IAP Belgian Science Policy (BriX network) [P6/23]
- European Commission through 13-ENSAR [RII3-CT-2010-262010]
- French Research National Agency (ANR) [ANR-08-BLAN-0116-01]
- European Research Council [ERC-2011-AdG-291561-HELIOS]
The laser ionization efficiency of the Leuven gas cell-based laser ion source was investigated under on- and off-line conditions using two distinctly different laser setups: a low-repetition rate dye laser system and a high-repetition rate Ti:sapphire laser system. A systematic study of the ion signal dependence on repetition rate and laser pulse energy was performed in off-line tests using stable cobalt and copper isotopes. These studies also included in-gas-jet laser spectroscopy measurements on the hyperfine structure of Cu-63. A final run under on-line conditions in which the radioactive isotope Cu-59 (T-1/2 = 81.5 s) was produced, showed a comparable yield of the two laser systems for in-gas-cell ionization. However, a significantly improved time overlap by using the high-repetition rate laser system for in-gas-jet ionization was demonstrated by an increase of the overall duty cycle, and at the same time, pointed to the need for a better shaped atomic jet to reach higher ionization efficiencies. (C) 2012 Elsevier BM. All rights reserved.
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