I Source of the damping force in Lorentz model

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Lorentz oscillator model
Hi. I have got question about the damper term in lorentz oscillator model. I understand that "spring" term comes from interaction between nucleus and electron, driving term form external electric field acting on molecule. But I don't understand damping term. So my question is where does it come from? For me, damping phenomen must be associated with something (some matter) that slows down a given object. But how it can be possible inside atom which is empty? If this phenomen (term) cannot be explained by classical physics I would appreciate the reference to some quantum mechanical articles or books. Or maybe someone knows the answer to my question. I'd really appreciate if could tell me.
 
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Damping is the removal of energy from a vibratory system. The energy lost is either transmitted away from the system by some mechanism of radiation or dissipated within the system.

From "The role of damping in vibration theory" by S.H. Crandall (Journal of Sound and Vibration, Volume 11, Issue 1, January 1970, Pages 3-18)
 
Hi. I have got question as in title. How can idea of instantaneous dipole moment for atoms like, for example hydrogen be consistent with idea of orbitals? At my level of knowledge London dispersion forces are derived taking into account Bohr model of atom. But we know today that this model is not correct. If it would be correct I understand that at each time electron is at some point at radius at some angle and there is dipole moment at this time from nucleus to electron at orbit. But how...
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