[Pw_forum] VdM force

[Mehrnaz Anvari]

Dear Paulatto
Thanks a lot. I've studied a few about frozen-core approximation in the 
papers of Giannozzi about numerical methods in electronic structure. I think 
that this approximation is the first step to produce pseudopotential for a 
certain atom and then transfer it to particular crystal, but when I read 
your answer I became confused, because you wrote that the pseudopotentials & 
frozen-core are different types of approximation.(?)
Best Regards
Mehrnaz Anvari
Iran University Of Science & Technology   
 
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