Note

This website is presently under development. The primary website for MOPAC is still http://openmopac.net until the majority of its contents have been migrated here.

OUTPUT

The size of the normal output file can become very large when large systems are being used.  This can make it difficult to find interesting information. To reduce the amount of information printed to the output file, add OUTPUTto the keyword list.

To allow some blocks of data that would otherwise be suppressed by OUTPUT use OUTPUT followed by letters in parentheses,  Allowed letters are

Letter	Does not suppress
C	Coordinates
F	Force matrix (in a FORCE calculation)
G	Gradients
N	Normal coordinates (in a FORCE calculation)
O	Orientation (in a FORCE calculation)
P	Atomic Orbital Populations
Q	Fractional atomic charges
T	Topography (atom connectivity)
V	Starting velocity of atoms in a DRC/IRC
X	Cartesian coordinates

Thus, if fractional atomic charges are to be printed, but other voluminous data suppressed, use OUTPUT(Q).  If atomic orbital populations are also wanted, use OUTPUT(QP). Note that OUTPUT only suppresses output.  If some data would not normally be printed, for example, in a `1SCF <one_scf.html>`__ calculation the gradients would not be printed unless `GRADIENTS <gradients.html>`__ was also present, then adding letters to the OUTPUT keyword to not suppress the gradients would do nothing.