A study of the helium 31D → 21P → 11S cascade with algebraic computing

J. B. Wang*, J. F. Williams

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Coincidence intensities of the cascade decay 31D → 21P → 11S of helium excited by electron impact are computed using the symbolic manipulation package Mathematica. The formulation requires the calculation of a few thousand Clebsch-Gordan coefficients and rotation matrices, which would be extremely tedious to carry out by hand. A scheme is presented as an illustrative example of a lengthy and cumbersome calculation handled by Mathematica with ease.

Original languageEnglish
Pages (from-to)275-282
Number of pages8
JournalComputer Physics Communications
Issue number3
Publication statusPublished - 1993
Externally publishedYes


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