Formation of the trimer ion core in the heterogeneous rare gas cluster ions
Formation of the trimer ion core in the heterogeneous rare gas cluster ions
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DOI：
10.1063/1.476084
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发表时间：
1998-04-22
影响因子：
4.4
通讯作者：
Yamabe, S
中科院分区：
文献类型：
--
作者：
Hiraoka, K;Shimizu, A;Yamabe, S
使用脉冲电子束高压质谱仪测量了由混合稀有气体组成的簇离子的热化学稳定性。当 A 和 B 在元素周期表中彼此相邻时，发现三聚体离子核心的形成，即 A(+)(B)(2) 和 A(2)(+)(B)(1)。这种趋势与纯稀有气体团簇离子的趋势类似，即，当Rg=He、Ne、Ar、Kr和Xe时，离子核Rg(3)(+)的形成。尽管Ar和Xe在元素周期表中并不相邻，但Xe+(Ar)(2)发现了三聚体离子核的形成。这可能是由于Ar和Xe的电离势彼此接近。发现较大簇离子 A(+)(B)(2)(B)(n-2) 和 A(2)(+)(B)(1)(B)(n-1) 的键能与均质簇离子 (B)(3)(+)(B)(n-3) 的键能相似。实验键能通过使用改进的 G2(MP2) 方法的从头计算得到证实 [例如，Ar-2(+).He 为 0.2 kcal/mol（expt）和 0.3 kcal/mol（理论）]。 (C) 1998 年美国物理研究所。
Thermochemical stablities of the cluster ions composed of mixed rare gases were measured using a pulsed-electron beam high pressure mass spectrometer. The formation of trimer ion cores, i.e., A(+)(B)(2) and A(2)(+)(B)(1), was found when A and B are next to each other in the Periodic Table. This trend is similar to that for the pure rare gas cluster ions, i.e., the formation of ion core Rg(3)(+) for Rg = He, Ne, Ar, Kr, and Xe. Although Ar and Xe are not next to each other in the Periodic Table, the formation of the trimer ion core is found for Xe+(Ar)(2). This may be due to the fact that the ionization potentials of Ar and Xe are close to each other. The bond energies of larger cluster ions A(+)(B)(2)(B)(n-2) and A(2)(+)(B)(1)(B)(n-1) were found to be similar to those of homogenous cluster ions (B)(3)(+)(B)(n-3). The experimental bond energies were confirmed by ab initio calcuations with a modified G2(MP2) method [e.g., 0.2 kcal/mol (expt) and 0.3 kcal/mol (theory) for Ar-2(+).He]. (C) 1998 American Institute of Physics.