arc.calculations_atom_single.DynamicPolarizability.getPolarizability#

DynamicPolarizability.getPolarizability(driveWavelength, units='SI', accountForStateLifetime=False, mj=None)[source]#

Calculates of scalar, vector, tensor, core and pondermotive polarizability, and returns state corresponding to the closest transition resonance.

Note that pondermotive polarisability is calculated as \(\alpha_P = e^2 / (2 m_e \omega^2)\), i.e. assumes that the definition of the energy shift in field \(E\) is \(\frac{1}{2}\alpha_P E^2\). For more datils check the preprint arXiv:2007.12016 that introduced the update.

Parameters
  • driveWavelength (float) – wavelength of driving field (in units of m)

  • units (string) – optional, ‘SI’ or ‘a.u.’ (equivalently ‘au’), switches between SI units for returned result (\(Hz V^-2 m^2\) ) and atomic units (”\(a_0^3\) “). Defaul ‘SI’

  • accountForStateLifetime (bool) – optional, should we account for finite transition linewidths caused by finite state lifetimes. By default False.

Returns

scalar, vector, tensor, pondermotive polarisability of state, core polarisability and atomic state whose resonance is closest in energy. Returned units depend on units parameter (default SI).