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EMEta

Section Linear Response::Polarizabilities
Type float
Default 0.0

The imaginary part of the frequency, effectively a Lorentzian broadening for peaks in the spectrum. It can help convergence of the SCF cycle for the Sternheimer equation when on a resonance, and it can be used as a positive infinitesimal to get the imaginary parts of response functions at poles. In units of energy. Cannot be negative.

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