I would like to have this discussion on this forum.
Can we fire some particles to mid-air to explode to light after particle's lifetime ends? Is there a way to give a particle a lifetime, a color and a trajectory to fly?
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The fundamental issue is that colour is a layman's terms for wavelength (hence energy) of the photon. A particle that gives you green light for instance, would have to decay to two photons of wavelength around 550nm. This corresponds to a particle with a rest-mass energy of around 4 eV. For comparison, the electron (which is the lightest lepton) has a rest mass of 511 keV.
So basically, there are no particles with a low enough mass to convert directly into optical wavelength light.