[Pw_forum] Questions about ph.x output

[degironc]

lan haiping wrote:

> Dear developers:
>  
>        i try to understand the output of  ph.x , but failed.
>      Would you please  help me out of these naive problems ?
> 1 , what are these numbers meaning?
>  
>  "phonons of Nanotube at Gamma
>    1   32  8  8.0390000  4.0000000  4.0000000  0.0000000  0.0000000  
> 0.0000000

ntyp nat ibrav celldm(1) ...  celldm(6)

>             1  'C   '     10946.15867720511 "

ityp label mass_in_atomic_rydberg_units

> 2, why the dynamical matrix is 3 x 6 ?

it's a 3x3 complex matrix

Real_xx Im_xx Real_xy Im_xy Real_xz Im_xz
... ... .


stefano