I'm no expert with ABINIT myself, but I believe this is how it works.
If you look at the tutorial file: t1x.in, you should see this:
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The part that says "../../../Psps_for_tests/01h.pspgth" states the location pseudopotential file (for H atom) on your hard disk. Of course, the location given is relative to the location of the .files file (hence the "../../../") and depends on where you saved your pseudopotential file.
If you're working with more than 1 type of atom, just start a new line and give the next location. I don't know if the order matters, but I usually list them in the order that I list them in the znucl input variable. I don't think you can run ABINIT without using pseudopotential files. I hope that helps.