[Pw_forum] about the electron-phonon coefficients

[李晓东]

Dear all,

Greetings!

I have a simple question. In the appendix of the user guide (http://www.quantum-espresso.org/wp-content/uploads/Doc/ph_user_guide/node12.html),
the electron-phonon coefficient has a factor (1/M)^0.5. This is calculated in the ph.x program.  
Is the M the total mass of the unit cell, or reduced mass, or averaged mass?

Thanks very much.

regards,
Xiaodong Li
North Carolina State University, NC, US
 		 	   		  
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