Vacuum level for charged systems

[Nuri Yazdani]

A quick addition.. One thing I was thinking of doing was to use the energy 
of the deepest (lowest energy) states from the two calculations as an 
approximation to the difference in the reference levels. There are 543 
occupied molecular orbitals in my system, and the difference in energy from 
the HOMO to the deepest is 16eV. Would this in general be a reasonable 
assumption? 
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