The ABINIT Users Mailing List ( CLOSED )

["Rick Muller" <rmuller@sandia.gov>]

I realize that this is a FAQ, but I need a bit more clarification. I'm 
interested in doing some GW calculations for some hydrogen crystals I'm 
looking at, and I'm getting hung up on the calculation of the plasma 
frequency.

From searching through past posts, I know that the plasma frequency is 
given by

w_p = sqrt(4*pi*n*e^2/m_e)

I also found a post that says that the average electron density n is 
given in the abinit output, but I can't find this quantity anywhere.

Plus, even when I can calculate this, I'm having trouble making the 
units work out. From the tutorial, I see that the plasma frequency for 
Si is given as 16.7 eV, but I can't get this number to work out from 
the calculations I've done on Si. Heck, I can't even get the units to 
work.

I realize I'm probably being dense about something, and would be 
extremely grateful if someone could point me in the right direction, 
using small words that even a chemist can understand...

Rick

Rick Muller
rmuller@sandia.gov