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Section Time-Dependent::Propagation
Type float
Default 1.0

This variable defines the factor between the timescale of photonic and electronic movement. for more details see the documentation of TDIonicTimeScale If you also use TDIonicTimeScale, we advise to set TDPhotonicTimeScale = TDIonicTimeScale, in the case the photon frequency is in a vibrational energy range. Important: The electronic time step will be the value of TDTimeStep divided by this variable, so if you have determined an optimal electronic time step (that we can call dte), it is recommended that you define your time step as:

TDTimeStep = dte * TDPhotonicTimeScale

so you will always use the optimal electronic time step (more details).

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