铬/磷二元团簇的形成和光解  

Formation and Photodissociation of Chromium/Phosphorus Binary Clusters

作　　者：韩春英[1] 邢小鹏[1] 高振[1] 朱起鹤[1] 

机构地区：[1]中国科学院化学研究所分子反应动力学国家重点实验室,北京100080

出　　处：《高等学校化学学报》2001年第4期622-625,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金! (批准号 :2 9773 0 5 4)资助

摘　　要：用 53 2 nm的 Nd∶ YAG激光直接溅射铬 /磷粉末混合物样品产生铬 /磷团簇 ,并用串级飞行时间质谱仪研究了二元团簇的组份分布及紫外激光光解规律 .实验表明 ,铬 /磷极易形成富磷的二元团簇离子 ,Cr P+ m团簇离子系列表现出明显的奇偶振荡效应 ,且 Cr P+ 4,Crn P+ 8(n=1～ 4 ) ,Cr4 P+ 9,Cr5P+ 11,Cr6P+ 12 和 Cr8P+ 14 等为质谱中丰度较大的离子 ,不随样品组成的变化而变化 ,光解时主要以失去中性 P2 和 P4 的方式进行解离 ,尝试对其电子结构进行推测 .并与铬Chromium/Phosphorus binary clusters were produced by direct laser ablation and analyzed by tandem time of flight mass spectrometer. The main clusters formed were rich in phosphorus. There is an oscillation in CrP + m series(the peaks with even m are stronger than those with odd m , especially the peaks of CrP + 4 and CrP + 8 are the strongest) and this may be ascribed to the specific stability of P 4 structure. There are some strong peaks such as Cr 3P + 8, Cr 4P + 9, Cr 5P + 11 , Cr 6P + 12 , Cr 8P + 14 , etc. , which dont change with the change of the ratios of Cr to P in the samples, and their stability could be explained with an electron model of valence electrons filling the d orbitals of Cr. The results of photodissociation just accord with the model.

关 键 词：铬 磷 激光溅射 激光光解 形成机理 二元团簇 

分 类 号：O614.611[理学—无机化学] O613.62[理学—化学]