低速Ar^q＋(q=7-14)离子入射Au表面激发的X射线谱

X-ray Spectra Excited in Ar^(q+)(q=7—14) Incidence on Au Surface

研究了高电荷态离子40Arq+(q=7—14)轰击金属Au表面产生的特征X射线谱。实验结果表明,在弱束流(nA量级)的情况下,对于动能相同的入射离子,当电荷态比较高(q=11)时,便能有效地激发靶原子的特征X射线,单离子的X射线产额高达10-8量级。分析结果显示,入射离子的势能、动能和这种相互作用特有的镜像相互作用势能沉积在靶表面,使靶原子内壳层电子激发和电离,形成空穴和产生外壳层电子填充空穴辐射特征X射线,特征X射线的产额随入射离子的势能(电荷态)的增加而增加。

The Au atomic Mα characteristic X-ray spectrum has been measured for the slow highly charged ions Ar^q＋（q=7-14） impacting on Au surface. The result shows that as long as the charge state of pro- jectile is higher（q=11）, the characteristic X-rays of heavy atomic can be effectively excited even though the ionic beam is very weak（nA magnitude）, and the single ionic X-ray yield is in the order of 10^-8 and increases with potential energies of projectiles.