How to extract HF matrix from GAUSSIAN 09?

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Naresh Kumar

Try open bable software once, it converts the file formats and it is freely available.

Alexis Otero-Calvis

Try with cclib, maybe can do this

Tian Lu

The easiest way is using IOp(5/33=3), a lot of matrices including Fock matrix will be printed in each SCF iteration. Alternatively, you can try to use rwfdump utility to extract the matrix from .rwf file. The .fch/fchk doesn't contain Fock matrix.