Sent to CCL by: "J. ÂPhoenix" [himphoenixCCL_._gmail.com]
Dear CCLs,
I am trying to compute the Tozer's lambda parameter that relates the spatial overlap between orbitals in a certain excitation using TDDFT calculations (JCP, 128, 044118 (2008)). The procedure I am following is to extract the overlap matrix of AOs in the Gaussian output and then compute for each MO pair: <Psi_1|Psi_2> = sum_i sum_j c_1_i c_2_j <X_i|X_j>, using the MO coefficients. When coefficients are taken with their sign, I get an overlap of one between the same MO, and zero between different MOs. However, when I use the absolute value of the coefficients to compute the inner product of the moduli, overlaps larger than 1 are obtained in some cases.
Is there anything wrong in my procedure for computing the inner product of the moduli of two orbitals or is not expected to be a value between 0 and 1?
Thanks in advance,
J.
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