Chemical Selectivity of Laser Ion Source for on-Line Mass Separator

• 出 处: Chinese Journal of Nuclear Physics
• 发表日期: 1997年01期
• 关键词: selectivity stepwise pumped decreasing saturated ionization pulsed lives neutron

Thulium(Tm)atoms are resonantly ionized in a hot tube by stepwise excitations us-ing three dye lasers pumped by a series of copper vapor pulsed at a 10 kHz rate.The chemicalselectivity of the laser ion source is measured as a function of temperature of the tubes made ofTa,Nb-Zr and TaC.The chemical selectivity rises from 50 to 10000 with decreasing tube temp-erature and strongly depends on the tube material.A chemical selectivity of about 10000 withhigh efficiencies is obtained with the Nb-Zr and TaC tubes.Such a laser ion source can be usedin on-line mass separator to obtain isobarically pure ion beams.

Thulium (Tm) atoms are resonantly ionized in a hot tube by stepwise excitations us-ing three dye lasers pumped by a series of copper vapor pulsed at a 10 kHz rate. The chemicalselectivity of the laser ion source is measured as a function of temperature of the tubes made of Ta, Nb-Zr and TaC.The chemical selectivity rises from 50 to 10000 with decreasing tube temperature-erature and strongly depends on the tube material. A chemical selectivity of about 10000 with high efficiencyiencies is obtained with the Nb-Zr and TaC tubes.Such a laser ion source can be usedin on-line mass separator to obtain isobarically pure ion beams.