Obtaining 1e-integrals and 2e-integrals

[irfankhan10]

Is your feature request related to a problem? Please describe.
I don't want to run CCSD calculation to obtain 1e and 2e integrals

Describe the solution you'd like
Provide the ability to obtain 1e and 2e integrals from a HF calculation

Describe alternatives you've considered
No other alternatives considered

Additional context

[jeffhammond]

There's an option in TCE for this already. I implemented it years ago. I forgot the keyword. Will look it up later.

[jeffhammond]

eionly in tce block. You might need to edit source to get the format you want. Happy to guide you.

[jeffhammond]

See also #23

[edoapra]

The master branch has a module to dump the integrals in the Molecular Orbital basis using the fcidump format.
input example https://github.com/nwchemgit/nwchem/blob/master/QA/tests/fcidump_hf/fcidump_hf.nw

[schusteritsch]

When I use the eionly keyword I seem to get a different result than when looking at the 1 & 2 electron integrals you get when you for instance perform an MBPT2 calculations - both in terms of values and in terms of which ijkl elements are being printed. Should these be the same and I am doing something wrong?