化学学报 ›› 1998, Vol. 56 ›› Issue (2): 200-207. 上一篇    

研究论文

AgnSm^±和AunSm^±的激光产生与质谱研究

黄伟杰;刘朝阳;黄荣彬;郑兰荪   

  1. 厦门大学固体表面物理化学国家重点实验室;厦门大学化学系
  • 发布日期:1998-02-15

Laser generation and mass distribution of AgnSm^± and AunSm^±

HUANG WEIJIE;LIU CHAOYANG;HUANG RONGBIN;ZHENG LANSUN   

  • Published:1998-02-15

以高能量密度的脉冲激光束在高真空中直接溅射银(金)粉与硫的混合物, 产生了丰富的银-硫和金-硫二元原子族正负离子, 记录了它们的飞行时间质谱。通过对这些簇离子的组成与分布的分析, 发现了它们的一些结构规律。银硫簇离子以离子键为主, Ag2S是它们的主要结构单元, 其中Ag11S5^+和Ag9S5^-特别稳定; 金硫簇离子基本上是共价结构, 金原子间相互成键, 构成簇离子的核, 硫原子则仅与核表面的金原子配位, 其中Ag6S14^+, Au5S6^-的稳定性比较突出。

关键词: 统计分布, 激光, 飞行时间质谱法, 原子簇, 硫化银, 硫化金

Both binary cluster cations and anions composed of silver (gold) and sulfur atoms were generated by laser ablating the mixed silver (gold) and sulfur powders. From analyzing the compositions and distributions of the cluster ions, we find that the observed AgnSm^±, especially the larger cluster ions, are in ionic bonding, with Ag2S as structural unit, while the observed AunSm^± cluster ions are mainly covalent, with gold atoms bonding together to form the core of the clusters and sulfur atoms coordinating on the surface of the core. Several "magic number" clusters, such as Ag11S5^+, Ag9S5^-, Au8S14^+, Au5S6^-, etc. have been distinguished from the recorded mass spectra.

Key words: STATISTICAL DISTRIBUTION, LASER, TIME-OFF FLIGHT MASS SPECTROMETRY, SILVER SULFIDE, GOLD TRISULFIDE

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