摘要
用激光直接溅射和串级溅射两种方法产生铅／硫二元团簇，并用串级飞行时间质谱仪研究了二元团簇的组份及光解规律，用激光直接溅射铜＋硫混合样品时，组成为PbnSn-1+和PbnSn-的团簇丰度最大，是二元团簇的结构骨架和稳定组份，而用激光串级溅射铅样品和硫样品，通过铅团簇与硫团簇的反应，则可得到PbnSm+(n=1-3,m=0-9)和PbnSm-(n=1-7,m=0-9)。这两种二元团簇的产生方法对应两种不同的团簇形成机理。
The formation and photodissociation of Pb/S sluster ions,produced by tow different ways of laser ablation,were studied with a tandem time-of-flight mass spectrometer.By laser direct ablation on a mixed Pb+S sample, the cluster ions with the compositions of PbnSn-1+ or PbnSn- were the most abundant species and can be identified as the stable components of Pb/S cluster ions.By laser double ablation on separated Pb sample and S sample, the products were PbnSm+(n=1-3, m=0-9) and PbnSm-(n=1-7, m=0-9) formed through reactions between Pb clusters and S clusters.Form the distributions of cluster compositions and the photodissociation of clusters,we can confirm two different formation mechanisms of Pb/S clusters according to the producing ways of clusters.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1999年第1期22-27,共6页
Acta Physico-Chimica Sinica
基金
中国科学院化学研究所分子科学中心及所长基金
关键词
团簇
激光溅射
激光光解
飞行时间质谱
铅硫团簇
Lead/sulfur cluster,Laser ablation,Laser photodissociation,Time-of-flight mass spectrum
