I think that your NWChem installation has some issues.
This is what I am getting
ESP
1 C -0.012623 -0.126462 0.000000 0.859614
2 O -0.076603 -0.029780 0.000000 -0.532884
3 O 0.051495 -0.223203 0.000000 -0.256045
4 Mg 0.023050 0.231886 0.000000 1.929315
------------
2.000000
Dipole moment 5.092610
Quadrupole moment Qxx -21.368183
Qyy 39.690313
Qzz -18.322130
RMS deviation kJ/mol 0.304107
ABS deviation % 0.992530
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