QUANTUM PHENOMENA AND THE ZEROPOINT RADIATION-FIELD .2.

A previous paper was devoted to the discussion of a mew version of sto chastic electrodynamics (SED) and to the study of the conditions under which quantum mechanics can be derived from it, in the radiationless approximation. In this paper further effects on matter due to the zero point field are studied, such as atomic stability, radiative transitio ns, the Lamb shift, etc., and are shown to be correctly described by t he proposed version of SED. Also, a detailed energy-balance condition and a fluctuation-dissipation relation are established; it is shown in particular that equilibrium is attained only with a field spectrum si milar to omega(3). The proposed approach to shown to suggest an unders tanding of quantum mechanics as a kind of limit-cycle theory. Finally, a brief discussion is included about the nonchaotic behavior of the ( bounded) SED system in the quantum regime, as measured by Lyapunov exp onents.