Job types are specified by placing in the $CONTRL group keywords of the form: RUNTYP=keyword. Possibilities include:
| Keyword | Description |
|---|---|
| ENERGY | Single point calculation; no optimization |
| OPTIMIZE | Geometry optimization using analytical gradients |
| TRUDGE | Non-gradient geometry optimization |
| SADPOINT | Optimize transition state |
| IRC | Intrinsic reaction coordinate search for transition state; $IRC group required |
| DRC | Dynamic reaction coordinate search for transition state; $DRC group required |
| HESSIAN | Energy + gradient + second derivatives, incl. Vibrational analysis |