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Set a new default damp factor for exponential and gaussian damping

Joaquim Jornet Somoza requested to merge set_default_damping into develop

Description

The default value of the damping factor was set without taking into account the propagation time. I have done some test on the spectrum of the benzoaldehyde molecule, to select the Limit of the damping factor at the end of the propagation. (see attached files). I choosed a value of 0.0001 for a good compromise between resolution and noise in the baseline.

DampingFunctions_vs_TimePropagation_Spectra_eVunits

DampingFunctions_vs_DampingLimit_Spectra_eVunits_ZoomIn

DampingFunctions_vs_DampingLimit_Spectra_eVunits_3-8eV

Checklist

  • I have checked that my code follows the Octopus coding standards
  • [] I have added tests for all the new features added in this request.

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