Fri, 24 Jul 2020 12:42:39 +0000

Using ∆r to judge type of excitation for D-A-D type of system may be misleading. If the CT character is strong but the CT direction is symmetric with respect to A, the ∆r may still be very small.

I highly encourage you to use hole-electron analysis module (see Section 4.18.1 of Multiwfn manual for example) to visualize distribution of hole and electron, only when the CT is found to be unidirectional, the ∆r can be used to discuss CT character.

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Fri, 24 Jul 2020 11:17:38 +0000

Dear Sr
I am trying to calculate ∆r and Λ indices to characterize various electron excitation of Donor-Acceptor-Donor type dyes. The ∆r values obtained is less than 1 A. Can I be definite that my molecule is having LE type excitation than charge transfer type. Or these data is only valid for Donor- Acceptor dyes or is it valid of symmetric D-A-D type dyes.

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