Dear Kondaiah, I cannot see the picture you have attached (it looks blank here). Anyway, the way to tell if a mode is Transverse or Longitudinal is to have matdyn save the dynamical matrix for a place next to the Gamma point (e.g. q=[0.01 0. 0.], set the input variable fldyn="filename")
An the end of the dynamical matrix file you have the frequencies and the atom displacements (3 times number of atoms complex numbers). If the displacement for every atom is parallel to the q-point, the mode is Longitudinal; if it is orthogonal, the mode is Transverse. In every other case it is neither. You can then associated the frequency with the label. HTH On 20/11/14 15:43, Kondaiah Samudrala wrote: > Dear Dr. Lorenzo Paulatto > > > Thank you for the conformation.. How can I distinguish the both modes.. i.e > whether LO or TO. Because, in the phonon dispersion plot, I observed that my > GAMMA point having two numbers ( pls see the values Gamma-X and M to Gamma > directions...). Here with I am attaching the plot. > > > Please suggest me sir > > > with regards > > S. Appalakondaiah > > PhD Schloar > > University of Hyderabad > > > > > _______________________________________________ > Pw_forum mailing list > Pw_forum@pwscf.org > http://pwscf.org/mailman/listinfo/pw_forum > -- Dr. Lorenzo Paulatto IdR @ IMPMC -- CNRS & Université Paris 6 phone: +33 (0)1 44275 084 / skype: paulatz www: http://www-int.impmc.upmc.fr/~paulatto/ mail: 23-24/4é16 Boîte courrier 115, 4 place Jussieu 75252 Paris Cédex 05 _______________________________________________ Pw_forum mailing list Pw_forum@pwscf.org http://pwscf.org/mailman/listinfo/pw_forum