# TDDeltaStrength

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#### TDDeltaStrength

Section Time-Dependent::Response
Type float
Default 0

When no laser is applied, a delta (in time) perturbation with strength TDDeltaStrength can be applied. This is used to calculate, e.g., the linear optical spectra. If the ions are allowed to move, the kick will affect them also. The electric field is $-(\hbar k / e) \delta(t)$ for a dipole with zero wavevector, where k = TDDeltaStrength, which causes the wavefunctions instantaneously to acquire a phase $e^{ikx}$. The unit is inverse length.

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