Second, note that ESP defined in common way at a nuclear position is meaningless, because it must be infinitely large due to the contribution to ESP from the nucleus at the corresponding position. What is meaningful at a nuclear position is the ESP without contribution of the corresponding nucleus, that is "Total ESP without contribution from nuclear charge of atom xxx" in the output of main function 1 of Multiwfn. The ESP value at nuclear position involved in Suresh's work corresponds to this quantity.
]]>I have been using Multiwfn to try and do topology analysis. I've noticed a discrepancy in values, and was wondering which value is appropriate. I followed the procedure in 4.1.2 in the manual emulating getting dVnuc like Suresh's work.
If I submit a1, I get:
Total ESP: 0.9771869440E+03 a.u. ( 0.2659061E+05 eV, 0.6131946E+06 kcal/mol)
Total ESP without contribution from nuclear charge of atom 1:
-0.5916237480E+01 a.u. ( -0.1609890E+03 eV, -0.3712498E+04 kcal/mol)
Now, if I use the same input file and submit:
2
2
3
0
get CPs and coordinates I get this line for atom1:
7 0.33664193 -0.14486139 1.08024924 (3,-3) Nucleus: 1(La) (in Bohr)
If I go back to 1 Output all properties at a point
and submit
0.33664193 -0.14486139 1.08024924
and select that these coordinates are in bohr I get:
Total ESP: 0.3456113230E+10 a.u. ( 0.9404562E+11 eV, 0.2168746E+13 kcal/mol)
Can you explain which value is more applicable to MESP topology analysis and using dV values like Suresh's work?
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