1. In general for interacting particles , the above decompositions are " not " possible. 2. Klaus Lackner s scientific career started in the phenomenology of weakly interacting particles . 3. In the absence of spectral bleed-through, the cross-correlation function is zero for non-interacting particles . 4. In contrast to FCS, the cross-correlation function increases with increasing numbers of interacting particles . 5. The previous two equations do not apply to interacting particles . 6. To illustrate this, let us consider a system of " N " distinguishable, non-interacting particles . 7. The diagrams showed that the electromagnetic force is the interaction of photons between interacting particles . 8. Even poorly interacting particles , like neutrons and neutrinos, will become strongly interacting if given enough energy. 9. Ideal gas is a gas of non-interacting particles . 10. However, the charged current that gives the interaction its name is that of the interacting particles .