高电荷态离子^(126)Xe^(q+)与Ti固体表面作用的激发光谱  

Excitation spectra of light from the interaction of highly charged ^(126)Xe ^(q+)-ions with solid surface of Ti

作　　者：赵永涛[1] 张小安[1] 李福利[1] 肖国青[2] 詹文龙[2] 杨治虎[2] 

机构地区：[1]西安交通大学应用物理系,西安710049 [2]中国科学院近代物理研究所,兰州730000

出　　处：《物理学报》2003年第11期2768-2773,共6页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :1980 40 12和 10 2 740 5 8);国家自然科学基金重点项目 (批准号 :10 13 40 10 )资助的课题~~

摘　　要：报道用 15 0keV的高电荷态离子1 2 6 Xeq + (6≤q≤ 30 )轰击Ti固体表面产生 2 0 0— 10 0 0nm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 >qc≈ 2 0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qc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 .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) 126Xe q+ (6≤q≤30)with a kinetic energy of 150keV are reported. The results show that the characteristic spectral lines of the target atoms can be effectively excited by the SHCI even though the beam intensity of the incident ions is very weak (only about one per one nanosecond). We have also found that when the number of the peeled electrons of the projectile is beyond a critical value which depends on the properties of the target, about 20 for Ti, the spectral intensity of the characteristic spectral lines can be greatly enhanced. Theoretical analyses show that this phenomenon is closely related to the surface plasmon excitation of the free electron gas of the metal surface during the potential energy release of the single-electron transfer when the number of the peeled electrons is beyond the critical value.

关 键 词：高电荷态离子 特征谱线 激发光谱 氙离子 钛原子 离子轰击 高能物理学 

分 类 号：O482.4[理学—固体物理]