摘要
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—硫二元原子簇正负离子,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.银硫簇离子以离子健为主,Ag_2S是它们的主要结构单元,其中Ag_(11)S_5^+和Ag_9S_5^-特别稳定;金硫簇离子基本上是共价结构,金原子间相互成健,构成簇离子的核,硫原子则仅与核表面的金原子配位,其中Ag_6S_(14)^+,Au_5S_6^-的稳定性比较突出.
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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1998年第2期200-207,共8页
Acta Chimica Sinica
基金
Project supported by the National Fourdations Special for the Outstanding Young Scholar
关键词
原子簇离子
金
银
硫
统计分布
质谱
Cluster, silver, gold, sulfur, statistical distribution
