In this SSSP pseudopotential file for Quantum ESPRESSO, what does the "pn" column mean?
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1 Answer
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The "pn" column here gives the principal quantum number ("n") for the states of the pseudoatom, which is the "atom" that remains after the core electrons are removed and the original Coulomb potential is replaced with the pseudopotential.
For example, in the file you show, the $n=1$, $l=0$ state of the pseudo-atom corresponds to the $4S$ state ($n=4$, $l=0$) of the original all-electron atom.
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