MomentumTransfer

MomentumTransfer

Section Output
Type block

Momentum-transfer vector $\vec{q}$ to be used when calculating matrix elements $\left< f \left| e^{i \vec{q} \cdot \vec{r}} \right| i \right>$. This enables the calculation of the dynamical structure factor, which is closely related to generalized oscillator strengths. If the vector is not given, but TPA output is requested (Output = TPA), only the oscillator strengths are written in the output file. For example, to use $\vec{q}$ = (0.1, 0.2, 0.3), set

%MomentumTransfer
   0.1 | 0.2 | 0.3
%

 if (parse_block(namespace, 'MomentumTransfer', blk) == 0) then