  The electromagnetic momentum transferred transfered to scattering particles
is proportional to the intensity of the incident fields, however, the momentum
of single photons ($\hbar k$) does not naturally appear in these classical
expressions. Here, we discuss an alternative to Maxwell's stress tensor that
renders the classical electromagnetic field momentum compatible to the quantum
mechanical one. This is achieved through the introduction of the quantum
conversion which allows the transformation, including units, of the classical
fields to wave-function equivalent fields.
