[Pw_forum] Raman and IR spectral

[yumin qian]

>
>
>  Dear Prof.

    I have encontered a problems in calculation of Raman and IR spectroscopy
,using ph.x
    the crystal is metallic, so it can not be done ,
   1 Why the IR or Raman calcualtion should only limited to the insulating
system .
   2 How should I do if the system is metallic.



-- 
Sincerely Y. M. Qian
Lab.of Condensed Matter Theory and Materials Computation
Institute of Physics
Chinese Academy of Sciences
Tel:  + 8610 8264 9147
E-Mail:yuminqian at gmail.com <E-Mail%3Ayuminqian at gmail.com>
P.O.Box 603   Beijing 100190
China
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