サマリウムの対称電荷移行

Symmetric charge transfer of samarium

柴田 猛順; 小倉 浩一; 小池 文博*

Shibata, Takemasa; Ogura, Koichi; Koike, Fumihiro*

Sm, Smイオンの基底状態間の電荷移行Sm(F)+Sm(F)Sm(F)+Sm(F)はf電子殻がJ=0のため共鳴電荷移行のみが起こる。これに対し原子,イオンとも最も低い励起状態のSm(F)とSm(F)の反応ではf電子殻がJ=1のためSm(F)+Sm(F)Sm(F)+Sm(F)+0cm及びSm(F)+Sm(F)-1192cmの共鳴,非共鳴の反応経路がある。これまで共鳴,非共鳴の反応が独立に進み、それぞれ統計重率に比例するとして断面積を計算してきたが、共鳴,非共鳴の状態間の移行がある。ここでは、Sm(F)とSm(F)の反応について、各衝突係数で結合方程式によりすべての状態間の結合を考慮して断面積を計算した。その結果、断面積は6s電子の内側が閉殻で共鳴電荷移行のみの反応の場合に比べ少し小さいだけであり、共鳴,非共鳴の反応が独立に進むとして計算した値よりずっと大きいことを示した。

Charge transfer between samarium atoms and ions in the ground states is resonant because J of 4f electrons subshell inside 6s electrons is 0. On the other hand, charge transfer between samarium atoms and ions in the lowest excited states, that is, Sm(F) and Sm(F), has two reaction paths which are resonant and non-resonant since J of 4f electrons inside 6s electrons is 1. In the present paper the cross sections of charge transfer between samarium atoms and ions in the lowest excited states were calculated by solving the coupled equations considering interactions among all resonant and non-resonant states in the impact-parameter method. It is found that the cross sections are much larger than those calculated on the assumption of the independence of the resonant and non-resonant reactions and a little small compared with the usual symmetric resonance charge transfer.