Alpha-Quartz Phonons at Zero Wave Vector

2x2x2 Supercell

Structure and normal modes read from converted ABINIT output. www.abinit.org
Frequencies from the tabulation of Castex and Maddon.

vibration
vectors

spacefill off  spacefill 20%  spacefill 100% 
wireframe on  wireframe 0.1 
spin