中文摘要：

探测了动能为3.0-6.0 MeV的Eu20＋离子入射Au靶激发Eu的L-X射线谱，获得了射线产额与离子入射动能的实验关系.采用有心保守力作用下的两体碰撞模型，并考虑了离子的能损，计算了Eu离子与Au 原子碰撞过程中单离子L壳层空穴的产额.根据离子L 壳层空穴退激的荧光产额，给出了碰撞过程Eu单离子L-X射线产额与离子入射动能的理论关系.结果表明，射线产额的理论值与实验数据符合得较好.

英文摘要：

The Eu L X-ray emission from the impact of Eu20＋ions of 3.0-6.0 MeV kinetic energies on Au target is detected. We obtain the experimental relationship of single ion X-ray yield with kinetic energy of ions. Considering the ion stopping in the target, the yield of the single ion L shell holes produced by the collision of Eu20＋ ion with Au atom is calculated. According to the fluorescence yield of Eu L shell holes, we deduce the theoretical relationship of X-ray yields with kinetic energy of ion. The results show that the theoretical curve is well consistent with the experimental data.