 to acquire a phase exp(<i>ikx</i>).
 The unit is inverse length.

</p><hr width='30%' align='left'/>


<p><b><a name='TDDeltaStrengthMode'></a>TDDeltaStrengthMode</b>
<br/><i>Section</i>: Time-Dependent::Response
<br/><i>Type</i>: integer
<br/><i>Default</i>: kick_density
<br/><br> When calculating the density response via real-time propagation,
 one needs to perform an initial kick on the KS system, at
 time zero. Depending on what kind of response property one wants to obtain,
 this kick may be done in s