Dear Jane  Alam
The answer is yes, you can obtain vibrational frequencies for molecules. You 
need to use de Vibra package at the /Util directory on your installation.
For a simple example, please go at the Day-4 of the Cecam school on 2007. 
http://www.icmab.es/siesta/documentation/tutorials/Lyon-2007/Exercises-Lyon07.zip
Good luck
Ricardo

-------------------------------------------------------------------------
  Dr. Ricardo Faccio
  Prof. Adjunto de Física 
  Mail: Cryssmat-Lab., Cátedra de Física, DETEMA
  Facultad de Química, Universidad de la República
       Av. Gral. Flores 2124, C.C. 1157
       C.P. 11800, Montevideo, Uruguay.
  E-mail: [email protected]
  Phone: (+598) 2924 9859
              (+598) 2929 0648
  Fax:      (+598) 2924 1906
  Web:  http://cryssmat.fq.edu.uy/ricardo/ricardo.htm
---------------------------------------------------------------------------------
  ----- Original Message ----- 
  From: jane alam 
  To: [email protected] 
  Sent: Wednesday, January 12, 2011 4:45 AM
  Subject: [SIESTA-L] How to calculate vibrational frequencies of molecule with 
Siesta program?


  Hello all
  Let me know about How to calculate vibrational frequencies of molecule with 
Siesta program? can any body send me input and output files regarding to this 
problem?

  -- 
  Mohammad Jane Alam
  Research Scholar
  Physics Department
  A.M.U. Aligarh India

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