高电荷态离子126Xeq+与Ti固体表面作用的激发光谱

报道用150keV的高电荷态离子¹²⁶Xe^q+（6≤q≤30）轰击Ti固 体表面产生2 00—1000nm波段发射光谱的实验结果.结果显示，用电荷态足够高的离子作光谱激发源，无 需很强的束流强度（nA量级），便可激发起样品表面的原子和离子在可见光波段的特征谱线 .当入射离子剥离度q>q_c≈20时，Ti原子及其离子的特征谱线强度突然显著增强 ；不 同金属靶，特征谱线突然增强的q_c值不同.理论分析表明，这与q大于此临界值 后，单电子转移释放能量激发靶材料传导电子气体的表面等离激元密切相关. 关键词： 低速高电荷态离子 特征谱线 经典过垒模型 等离激元

Excitation spectra of light from the interaction of highly charged 126< /sup>Xeq+-ions with solid surface of Ti

The measurement results on 200—1000nm excitation spectra of light from a solid surface of Ti which is excited by slow highly-charged ions(SHCI) ^{126Xeq+ （6≤q≤30）with a kinetic energy of 150keV are reported. The results s how that the characteristic spectral lines of the target atoms can be effectivel y excited by the SHCI even though the beam intensity of the incident ions is ver y weak (only about one per one nanosecond). We have also found that when the num ber of the peeled electrons of the projectile is beyond a critical value which d epends on the properties of the target, about 20 for Ti, the spectral intensity of the characteristic spectral lines can be greatly enhanced. Theoretical analys es show that this phenomenon is closely related to the surface plasmon excitatio n of the free electron gas of the metal surface during the potential energy rele ase of the single-electron transfer when the number of the peeled electrons is b eyond the critical value.}