[Pw_forum] Particular Phonon mode

[Bipul Rakshit]

Dear PWscf users,
I am doing gamma Phonon calculation on LaMnO3. Since the unit cell contain
20 atoms, so at gamma i am getting 60 frequencies (3 acoustic modes ~ 0)

If I am just interested in just the first three frequencies ( the acoustic
modes), what changes i have to made in the input file.

phonons of LaMnO3-pero
 &inputph
  tr2_ph=1.0d-10,
  alpha_mix(1)= 0.7,
   prefix='lamno3',
!  epsil=.true.,
!  ldisp=.true.,
!  nq1=2, nq2=2, nq3=2
!  iq1=6, iq2=6, iq3=6
!   lnscf= .true.
  amass(1)= 138.9055,
  amass(2)=54.938049,
   amass(3)=15.9994,
  outdir = './OUT',
  fildyn='LaMnO3.dynG',
 /
 0.0 0.0 0.0

-- 
Dr. Bipul Rakshit
Research Associate,
S N Bose Centre for Basic Sciences,
Salt Lake,
Kolkata 700 098
India
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.quantum-espresso.org/pipermail/users/attachments/20091103/4174389b/attachment.html>