  The wave-structure of moving electrons is analyzed on a fundamental level by
employing a modified de Broglie relation. Formalizing the wave-function $\psi$
in real notation yields internal energy components due to mass oscillations.
The wave-features can then be referred to physical waves of discrete frequency
$\nu$ and the classical dispersion relation $\lambda \nu = u $, complying with
the classical wave equation. Including external potentials yields the
Schr\"odinger equation, which, in this context, is arbitrary due to the
internal energy components. It can be established that the uncertainty
relations are an expression of this, fundamental, arbitrariness. Electrons and
photons can be described by an identical formalism, providing formulations
equivalent to the Maxwell equations. The wave equations of intrinsic particle
properties are Lorentz invariant considering total energy of particles,
although transformations into a moving reference frame lead to an increase of
intrinsic potentials. Interactions of photons and electrons are treated
extensively, the results achieved are equivalent to the results in quantum
theory. Electrostatic interactions provide, a posteriori, a justification for
the initial assumption of electron-wave stability: the stability of electron
waves can be referred to vanishing intrinsic fields of interaction. The concept
finally allows the conclusion that a significant correlation for a pair of spin
particles in EPR--like measurements is likely to violate the uncertainty
relations.
