How is light produced without heat?
Answer:
Energy within atoms is expressed through electrons. When an atom recieves extra energy, and electron may "jump" to an orbital of a higher energy level. When the electron returns back to its original orbital, it releases energy in the form of a photon. Altough most times heat is produced in addition to light, heat is not necessary. Chemiluminescence, as you said, is the name for light without heat. Chemiluminescent light is generally produced by chemical reactions rather than electrically in a process such as lightbulbs.
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When electrons or atoms are excited, in molecular orbital theory they jump from the ground state to the excited state. They can return to the ground state by way of heat OR non radiative decay(light). They basically take the easiest route to get back down to the ground state. In those types of systems that is the easiest and fastest route to return to the ground state. Basically in chemluminescence the reaction of the two chemicals is enough energy to excite the electrons and in that system the fastest route to the ground state is by way of light.
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