qspec.v_recoil  (  f ,  m  )[source]

The change of velocity of an atom at rest $\delta v = hf / (mc)$ due to the absorption of a photon with frequency $f$.

Parameters:

farray_like

The frequency of light $f$ in the atom's rest frame (MHz).

marray_like

The mass $m$ of the atom (u).

Returns:

outndarray

The change of velocity $\delta v$ (m/s).