[Pw_forum] Polarizability calculation

[anne etindele]

Dear allI am trying to determine the electric dipole polarizability of C60. 
Using Phonon, I got a single value, whereas whit TDDFPT the dipole polarizability for each value of the frequency is a 3*3 matrix. I would like 
to know if the tow calculations are equivalent. If there are, How can I move from the matrix to the single value.

 Anne Justine ETINDELE 
Assistant Lecturer 
Higher Teachers Training College University of Yaounde I P.O. Box 47 Yaounde 
Cameroon
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