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column 3) or the phase correction of ref 3 (column 4). It is evident that the phase correction expression of ref 3 is valid for the case AV = 0, but not when AV 0.In conclusion, therefore, we have confirmed that use of the type of WKB edge-effect correction originally proposed by Le Roy et al.3 can greatly accelerate the convergence of numerical tunneling probability calculations for potentials with long-range tails. However, for asymmetric barriers, the expression for the WKB phase correction given in ref 3 is in error and should be replaced by the present more general eq 8 and 9.

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