[Pw_forum] Problem with Raman and Infrared Active Modes

[Paolo Giannozzi]

On Fri, 2011-10-07 at 12:15 +0300, HASAN SAHIN wrote:

> all the modes (including acoustics) are both Raman and
>  Infrared active. Being both R+IR active of all modes
>  seems unphysical.

if there is no symmetry, all modes are both Raman- and IR-active

P.
-- 
Paolo Giannozzi, IOM-Democritos and University of Udine, Italy