A program written in the MAPLE symbolic computational language was written to compute analytic and numerical expressions for the long-range multipole moment expansion of the electrostatic (Coulombic) perturbation operator for a system of N atoms in arbitrary orientations in space. These expressions are written in terms of the multipole moment operators on individual interacting atoms. The program was tested on a system consisting of a ground-state hydrogen atom interacting with two protons in three different configurations, and the results were found to be in agreement with manual calculations. This approach can produce, with relative ease, the long-range multipole expansion for systems with large numbers of interacting atoms or ions. (C) 1997 John Wiley & Sons, Inc. [References: 6]
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机译：编写了用MAPLE符号计算语言编写的程序，以计算空间中任意方向的N原子系统的静电（库仑）摄动算符的远距离多极矩展开的解析和数值表达式。这些表达式是根据相互作用的单个原子上的多极矩算符编写的。该程序在由基态氢原子与三种不同构型的两个质子相互作用的系统上进行了测试，结果与人工计算相符。对于具有大量相互作用原子或离子的系统，此方法可以相对轻松地产生远距离多极扩展。 （C）1997 John Wiley＆Sons，Inc. [参考：6]
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