Pseudopotentials problems in NWChem!!!

[Chi-Yuan Chen <chenca = email.uc.edu>]

Dear Sirs:
 I have to use pseudopotentials(Vanderbilt ultra-soft
 pseudopotentials & Troullier-Martins norm-conserving
 pseudopotentials) in CPMD to simulate some proton transfer
 phenomena, but I do have some problems need to be clarified
 first.
 1)For Vanderbilt ultra-soft pseudopotentials, does Pspw have
 this pseudopotential? If it does, what's the keyword?
 Do I need to specify the cutoff radius for it, or it has
 default value?
 2)For Troullier-Martins norm-conserving pseudopotentials,
 how to decide the cutoff radius for different atoms? Is
 there any principle for choosing/calculating cutoff radius?
 There are only three different atoms(C, N, and H) in my
 system, but I need to know how to specify the cutoff radius
 for different atoms.
 Thanks in advance.
 Chi-Yuan Chen
 Graduate Student
 OBR Center
 for Computer-Aided Molecular Design
 Department of Chemical and Materials Engineering
 University of Cincinnati
 Cincinnati, Ohio 45221-0171
 Email: chenca = email.uc.edu