Al^（10＋）的电子碰撞激发和电离

ELECTRON-IMPAC-EXCITATION AND IONIZATION FOR Al￣(10+)

用扭曲波方法计算了Ａｌ￣（１０＋）离子基态和第一激发态的１ｓ、２ｓ和２ｐ电子的激发和电离截面。激发截面与文献［３］的结果符合很好。同时，２ｓ电离截面与文献［４］的结果也是一致的。在电离阈值处实现了激发截面（乘以“态密度”）与电离能量微分截面的光滑联接。

AbstractElectron-ion collision is a principle dynamic phenomena and is a very important process forthe diagnostic of high-temperature plasma and the analysis of ion distribution.We have been cal-culated the electron-impact-excitation and ionization cross sections from initial state electronn_il_i to transit to final states n_jl_j or εl_j through s,p,d,f, channels as follows equatin(3),(9).There are many Slater integration included in Q_H. In Slater integration, radius wave functionsatisfies Schrodinger E.q(12).The E.q(12).is computed within Cowan code modified by us.The excitation cross sections we calculated argee with the results published by H.L.Zhang eta1.with those given by S.M. Younger(see table 1,2,3).When we consider final state electronwith same angular momentum l_j as a channel,bound electron wave function can benormalized by energy so that both of the bound and continuum wave function are comparableanalytically,By above way,values σ_(nl)·N_n of the excitation cross section can be connected smoothlywith ones dσ_(εl)/dε of ionization differental cross section at the point of the threshold valueof ionzation. So do oscillator strength f_(nl)·N_n and oscillator strength density df_(εl)/dε.Here N_nis “state density”,Z_c=Z-N+1.Figure 1 show respectively electron impact exciation and ionization cross sections of ls, 2s,2p along s,p,d,f…channel which vary with electron energy.Figure 2 shows the variation ofoscillator strength with electron energy.