^(129)Xe^(30+)入射Au靶表面的X射线辐射

X ray spectra induced by ^(129)Xe^(30+) impacting the Au surface

当不同动能(350-600keV)高电荷态离子129Xe30+入射Au表面过程中,发出了1.65keV的X射线和靶原子的Mα特征X射线.分析表明:高电荷态离子与Au表面相互作用过程中,Xe离子3d壳层的电子被激发,形成空穴,4f电子偶极跃迁辐射1.65keVM-X射线.同时,靶原子Au的3s电子被激发,退激辐射M-X射线.利用经典过垒模型解释了Xe的M-X射的产额随入射离子的动能增加而减小,靶原子的特征X射线产额随入射离子的动能增加而增加的原因.

X ray emission from Xe30＋ions（kinetic energy 350-600 keV）impacting on an Au target surface was investigated.The 1.65 keV M-X ray and the Au atomic Mα characteristic X rays were measured.The results show that because the 3d electron of the Xe ion is excited to occur a vacancy,the 1.65 keV M-X ray are emit from the electron transition between 4f to 3d energy level.The 3s electron of the Au target atom is ionized to form a hole in the M-shell,the Mα characteristic X rays are radiated by 4f electron filling in the hole.It was also found that the yield of such characteristic X rays is decreasing with increasing the projectile kinetic energy.The yield of the characteristic Au X rays increases with increasing the projectile kinetic energy.These phenomena are analyzed with the classical coulomb over the barrier mode.