气相过渡金属钽和钇-碳链团簇的质谱研究  

Mass Spectroscopy for Investigation of Transition Metal Tantalum and Yttrium-Carbon Clusters

作　　者：周留柱[1] 孟祥省[1] 刘在国[1] 李爱国[1] 孔祥和[1] 

机构地区：[1]曲阜师范大学物理系,山东省激光偏光与信息技术重点实验室,曲阜273165

出　　处：《分析化学》2010年第11期1643-1646,共4页Chinese Journal of Analytical Chemistry

基　　金：曲阜师范大学博士科研启动资金资助

摘　　要：Nd:YAG产生的二倍频532nm激光消融金属靶表面,同时含有3%乙炔的氦载气喷向旋转的金属靶,通过等离子体反应形成中性的气相过度金属-碳链团簇分子。经过超声膨胀,由Skimmer形成准直的分子束,进入飞行时间质谱仪的电离区,被193nm的准分子激光电离。实验发现,钽奇数碳链的过渡金属钽团簇离子信号较小,而偶数碳链的团簇离子信号较大。钇碳链观察到了YCm+(m=1～4,6)、Y2Cn+(n=2,4,6)和YCnH2+(n=2～6)的离子信号。Metal-carbon clusters ion signal of the transition Tantalum and Yttrium were obtained with differential sampling system and the resonance enhanced multi-photon ionization technique. The second-harmonic output of a Nd： YAG laser is used to ablate the surface of rotating metal rod. The laser vaporization of the metal rod with helium carrier-gas contained 3% acetylene. Metal-carbon mixed clusters were formed through plasma reactions between laser-ablated metal atoms and C2H2. Cluster species underwent a supersonic expansion and formed a collimated beam with skimmer and entered into ionization region of a time-of-flight （ TOF） mass spectrometer,and then ionized by 193 nm excimer laser. The results showed that the intensities of ion signal of odd Tantalum-carbon chains were smaller,while the intensities of ion signal of even Tantalum-carbon chains were bigger. The Yttrium carbide cluster ions YC m＋ （ m = 1-4） ,Y2C n＋ （ n = 2,4,6） and YCnH 2＋ （ n = 2 6） were also observed.

关 键 词：碳链-过渡金属团簇 差分进样 飞行时间质谱 

分 类 号：O614[理学—无机化学]