Dear Zhu Xi,
You have to specify different labels for each atom:

NumberOfAtoms       3
NumberOfSpecies    3

%block ChemicalSpeciesLabel
 1  14  C      # Species index, atomic number, species label
 2    8  O1
 3    8  O2
%endblock ChemicalSpeciesLabel

AtomicCoordinatesFormat  Ang
%block AtomicCoordinatesAndAtomicSpecies
 0.000  0.000  0.000  1
 xxxxx  yyyyy  0.000  2 #O1
-xxxxx  yyyyy 0.000  3 #O2
%endblock AtomicCoordinatesAndAtomicSpecies

%block PaoBasis
C #fill the basis for C

O1 #basis for O1

O2  #basis for O2
%endblock

Best regards,
Eduardo

On 23/04/2008, at 13:14, Zhu Xi wrote:

Dear users;
How to use 2 different basis for the same element? such as use both
DZP and SZP for different  O atoms in CO2. Thank you.


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