The stationary solutions for a bound electron immersed in the random z
eropoint radiation field of stochastic electrodynamics are studied, un
der the assumption that the characteristic Fourier frequencies of thes
e solutions are not random. Under this assumption, the response of the
particle to the field is linear and does not mix frequencies, irrespe
ctively of the form of the binding force; the fluctuations of the rand
om field fix the scale of the response. The effective radiation field
that supports the stationary states of motion is no longer the free va
cuum field, but a modified form of it with new statistical properties.
The theory is expressed naturally in terms of matrices (or operators)
, and it leads to the Heisenberg equations and the Hilbert space forma
lism of quantum mechanics in the radiationless approximation. The conn
ection with the poissonian formulation of stochastic electrodynamics i
s also established. At the end we briefly discuss a few important aspe
cts of quantum mechanics,which the present theory helps to clarify.