[Pw_forum] Question on scf - nscf and kpoints

[张 洪彬]

Hello everyone here:
  I am trying to use pwSCF to do some calculation, however I have some 
question:
1. Is a scf calculation indispensable before calculation on phonon and band 
structure? What's the difference between scf and nscf(maybe from the 
package realization itsself)?
2. How to determine kpoints for a system step by step? And is there any 
criterion? pls refer me to some paper or book.
3. As to charge density plot, what we can learn from it exactly? 

Though my questions seem to be laughable, but I really want to make it 
clear as enough as possible. Thanks in advance.

Regards

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