类钴氙离子入射Ni表面激发的红外光谱线和X射线谱

Cobalt-like-Xe-induced infrared light and x-ray emission at Ni surface

当高电荷态类钴氙离子(cobaltlike-Xe,Xe27+)入射金属Ni表面过程中,共振电子俘获释放势能完成中性化,形成多激发态的Xe原子,其外壳层电子退激辐射红外光谱线.入射离子特殊的势能释放方式、离子动能和金属表面引起离子增益的能量在极短的时间(飞秒量级)沉积靶平方纳米尺度的空间范围,引起靶表面原子激发和电离,形成复杂组态之间的跃迁,特别是偶极禁戒跃迁(电四极跃迁、磁偶极跃)和X射线发射.单离子X射线产额随入射离子的动能增加而增加.

The highly charged ions 129Xe 27＋ impacting on Ni surface are neutralized by resonant capturing of electrons of metallic conduction band and release of potential energies.The multiply excited Xe atoms are formed and the outer-shell electrons are de-excited by emitting infrared photons.In the process,within femtoseconds,the projectile total energies are deposited on the target surface（on the nanometers scale）,which excites and ionizes the target atoms.The characteristic transitions between complex configurations of atoms and ions occur, especially the characteristic forbidden transition （ M1 and E2） of Ni Ⅰ and Ni Ⅱ , and the X-ray emission. The increasing of X-ray yield per ion with kinetic energies of projectile was found.