[WIEN]a question on lapw0

[Jiang Jun]

Dear Professor Blaha:
   I still have a problem on the choice of the zero-point of the potential 
when I wonder the coherent energy of a crystal.Because we all know an 
electron energy in atom is definded as the negative value of the energy 
needed of moving it to infinity from the atom.While in WIEN2K,the total 
energy of a crystal is calculated with potential zero-point defined as the 
average of the potential in the interstitial region.I could understand that 
the choice of potential zero-point is arbitrary and no physical meaning and 
also keep it in mind that the total-Energy does NOT depend on this choice.

   As far as I could understand I believe that there MUST BE a constant 
added to both sides of the Schrodinger Equation so that it could give the 
correct total-energy and generally speak,this constant is not the same one 
from differnent system.My question is how to determin this constant in source 
procedure of Lapw0 and whether it is possible to detect it from the output-
files such as case.output0 and/or case.scf0?(I have confirmed that :VZERO 
just only meaningful for slab but not for crystal itself)

   In my opinion this is an important and elementary question.Maybe my 
consider is not correct,please pointit out and I really want to grasp the 
spirit of WIEN2k more completely.Expect your patient and kind reply eagerly!

   Best Regards!
                                                        your sincerly Jun
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