Calculations of Heat Deposition in a Target System Bombarded by High Energy Charged Particles

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JAERI-M 84-154, 43 Pages, 1984/09

JAERI-M-84-154.pdf:1.18MB

no abstracts in English

Effect of excited states in atom and ion contributing to the surface-ionization efficiency

Asai, Masato; Sato, Tetsuya; Kaneya, Yusuke

no journal, , 

To experimentally determine the first ionization energy of element 103, Lr, we have newly developed a surface ionization method and have investigated its feasibility. We have measured surface ionization efficiencies of various lanthanide elements as a function of the first ionization energy, and investigated whether the surface ionization efficiencies can be reproduced by the Saha-Langmuir equation which is the equation to describe the surface ionization process. We have found that the effect of excited states in atom and ion largely contributes to the surface ionization efficiency in the Saha-Langmuir equation. By taking account of this effect, we have reproduced the measured ionization efficiencies of all the lanthanide elements with good accuracies.