qspec.f_recoil_v  (  v ,  alpha ,  f_lab ,  m  )[source]

The change of a transition frequency of an atom moving with velocity $v$ (in the direction of its velocity vector) due to the absorption of a laser photon with frequency $f$. Implemented as df = f_recoil(doppler(f_lab, v, alpha, return_frame='atom'), m)

Parameters:

varray_like

The velocity $v$ of the atom (m/s).

alphaarray_like

The angle $\alpha$ between a velocity- and a wave-vector in the laboratory frame (rad).

f_labarray_like

The frequency of light $f$ in the laboratory frame (MHz).

marray_like

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

Returns:

outndarray

The change of the transition frequency $\delta f$ (MHz).