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Schwinger-Lanczos algorithm for calculation of off-shell T-matrix elements and Wynn's epsilon algorithm

机译:Schwinger-Lanczos算法用于计算脱壳T矩阵元素和Wynn的epsilon算法

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摘要

A generalization of the Schwinger-Lanczos algorithm for the calculation of the off-shell T-matrix elements is presented and shown to be equivalent to the Wynn's epsilon algorithm for acceleration of the Born series. Both methods are applied to the calculation of cross section for the dissociative attachment of electrons to hydrogen molecule, e~- + H_2 → H + H~-. Although formally fully equivalent both methods behave very differently numerically. It is shown that the Schwinger-Lanczos algorithm is more stable and generally superior to all other methods discussed in this paper.
机译:提出了用于计算脱壳T矩阵元素的Schwinger-Lanczos算法的一般化,并被证明等同于Wynn的epsilon算法,用于加速Born级数。两种方法都适用于计算电子与氢分子e〜-+ H_2→H + H〜-的解离连接的截面。尽管这两种方法在形式上完全等效,但它们在数值上的行为却大不相同。结果表明,Schwinger-Lanczos算法更稳定,并且通常优于本文讨论的所有其他方法。

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