[Pw_forum] phonon mode symmetry format

[karan deep]

my question is just to confirm  the format used to write phonon modes at
end of output files of Ph.x. for some structures
it is
     omega( 25 - 27) =        553.2  [cm-1]   --> T_1u G_15  G_4- I
     omega( 28 - 29) =        588.8  [cm-1]   --> E_g  G_12  G_3+ R
     omega( 30 - 30) =        829.2  [cm-1]   --> A_1g G_1   G_1+ R
here only one Eg line is there

but for some we have Eg and Eg* type thing i.e a why a degenerate frequency
is written two times.what are these eg* Eu* things
     omega( 28 - 29) =        700.2  [cm-1]   --> E_u             I
     omega( 28 - 29) =        700.2  [cm-1]   --> E_u*            I
     omega( 30 - 30) =        780.0  [cm-1]   --> A_g             R
     omega( 22 - 23) =        425.2  [cm-1]   --> E_g             R
     omega( 22 - 23) =        425.2  [cm-1]   --> E_g*            R
also the G symbols are not here

why this is so
Are both correct or there is some mistake in the second one

Karandeep
Research Scholar
Physics Department,
IIT,  Delhi
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