$negfintervalleyopticalphonon

If you use the command $negfifscattering and the second term is 2, then use the command $negfintervalleyopticalphonon to setup the related parameters of intervalley optical phonon scattering(the g-type and f-type) of Si.
The equation of nonpolar optical phonon scattering(deformation potential scattering):

$W_{op}^{ab}(k)=\frac{\pi D_{op}^2}{\rho {\omega }_0}[n({\omega }_0)]I_{if}{N}_{1D}(E_k+\hslash {\omega }_0)$

$W_{op}^{em}(k)=\frac{\pi D_{op}^2}{\rho {\omega }_0}[n({\omega }_0)+1]I_{if}{N}_{1D}(E_k-\hslash {\omega }_0)$

$negfintervalleyopticalphonon
$\rho$  ${ϵ}_{\mathrm{\infty }}$  ${ϵ}_s$
$D_{op}$ ${\omega }_0$
$D_{op2}$ ${\omega }_{02}$

Example:

$negfintervalleyopticalphonon
2329.0 0.0 11.7
1.760e-8 9.4476e13
3.328e-9 8.9905e13

related commands:

 $ifsolvenegf,  $negfifscattering