Color Spectrum And Particle Size

If we make a guess at the color spectrum as due to particles of increasing size, and align the blue region with small \(a_{\psi\,c}\) particles,

The ultraviolet region ends abruptly with the smallest \(a_{\psi\,c}\) but the infra-red region extends indefinitely with increasing \(a_{\psi\,\pi}\) that can exist in  high intensity fields (high temperature, high acceleration, high voltage).

And neutral \(a_{\psi\,ne}\) is without a charge may just be invisible.