摘要
原子簇的产生与研究,近年来已成为化学与物理学界兴趣的一个焦点。最近我们在自制的装置上,首次观察到各种大小的磷原子簇,并通过对其正负离子质谱的分析,探讨了其可能的构型。实验装置的原理与详细构造已有另文介绍。本实验选择的激光是Nd:YAG激光器的倍频输出(532nm),聚焦后作用于样品的激光功率密度接近10~7W·cm^(-2)。实验的单质磷样品是多次提纯后的红磷。图1所示的磷原子簇的正负离子质谱由两台飞行时间质谱计同时记录,由连续30次采集的数据平均而成。
Both positive and negative phosphrus cluster ions were generated on a homemade laser-probe time-of-flight mass spectrometer. P_6^+ has the highest intensity in positive ion mass spectrum, and P_5^- for negative ions. It is proposed that both P_6^+ and P_5^- adopt the planar monocyclic configuration and are aromatic according to Hückel Rule. Further analysis of mass spectra shows that all cluster anions are composed of 5-membered rings and cations arc composed of 6-membered rings.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1991年第6期646-647,共2页
Acta Physico-Chimica Sinica
基金
国家教委优秀青年教师研究基金
关键词
磷原子簇
正负离子
激光
质谱
Phosphrus cluster, Laser generation, Mass spectrometry
