I would suggest that use be made of the covariant mass of ECE theory, defined by:
R = (mc / h bar) squared
R is defined directly from geometry, the very fundamental tetrad postulate of Cartan. The interaction of a photon and electron is governed by two ECE wave equations, in fact I have already developed this method in papers such as UFT 19 and 78. Advanced computational methods need to be applied.
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