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摘要: The variational co-detor method has been applied to calculate wave functions and energies for the P 2 S states of Cl, 1 state Cl , 3 D 0 S. This is first application atoms second chemical period, thus an considerably more complicated circumstances than have previously examined. Except there are no records any previous approximations comparable accuracy these functions, predictions energy values. introduction relativistic corrections investigated incorporated in this calculation. It was also found possible adapt several sections calculation automatic calculating machine, EDSAC, which performed a considerable amount computation.