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10 MOLECULAR GEOMETRY 68<br />

entries. Dummy centres are also reset to their original charges if (i) and INT command is encountered,<br />

or (ii) a new geometry input is encountered.<br />

The program does not recognize automatically if the symmetry is reduced by defining dummy<br />

atoms. Therefore, for a given dummy atom, either all symmetry equivalent atoms must also be<br />

dummies, or the symmetry must be reduced manually as required. An error will result if the<br />

symmetry is not consistent with the dummy centre definitions.<br />

10.7.1 Counterpoise calculations<br />

Counterpoise corrections are easily performed using dummy cards. One first computes the<br />

energy of the total system, and then for the subsystems using dummy cards.

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