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[bin chen <binchen0401@gmail.com>]

Hello Everyone,

After a phonon calculation at q point how could I obtain the vibration
direction of each atom from the phonon eigendisplacements?
i.e: I know the eigendisplacements of M point and H point.
M point
 Eigendisplacements
 (will be given, for each mode : in cartesian coordinates
   for each atom the real part of the displacement vector,
   then the imaginary part of the displacement vector)
  Mode number    1   Energy   -1.376462E-04
 Attention : low frequency mode.
   (Could be unstable or acoustic mode)
;  1  8.85077623E-04 -1.53299946E-03  0.00000000E+00
;     0.00000000E+00  0.00000000E+00  0.00000000E+00
;  2  8.85074741E-04 -1.53299468E-03  0.00000000E+00
;     0.00000000E+00  0.00000000E+00  0.00000000E+00
;  3  9.25741287E-04 -1.60343070E-03  0.00000000E+00
;     0.00000000E+00  0.00000000E+00  0.00000000E+00
;  4  9.25744259E-04 -1.60343595E-03  0.00000000E+00
;     0.00000000E+00  0.00000000E+00  0.00000000E+00
H point
 Eigendisplacements
 (will be given, for each mode : in cartesian coordinates
   for each atom the real part of the displacement vector,
   then the imaginary part of the displacement vector)
  Mode number    1   Energy   -1.712882E-04
 Attention : low frequency mode.
   (Could be unstable or acoustic mode)
;  1  4.95643631E-05  7.10123124E-04 -2.67003155E-04
;    -7.10123281E-04  4.95640911E-05  9.69330867E-04
;  2 -3.57461204E-04 -9.84627462E-05  1.92564773E-03
;    -9.84632730E-05  3.57461134E-04  1.34403819E-04
;  3  5.49285047E-05  7.86977730E-04 -2.83291654E-04
;    -7.86977167E-04  5.49283645E-05  1.02846494E-03
;  4 -3.96147876E-04 -1.09119309E-04  2.04312204E-03
;    -1.09119475E-04  3.96148148E-04  1.42603120E-04
How can i get the  vibration direction of each atom from the
eigendisplacements.
1,2 is O
3,4 is Zn


thanks and regards,
bin chen