There may be a photochemical reaction in the Orb's atmosphere.

There are other photochemical reactions with carbyne complexes as well.

In case of photochemical reactions light provides the activation energy.

Over the last century and earlier an immense number of photochemical reactions have been uncovered.

Still another type of photochemical reaction is the di-pi-methane rearrangement.

It is a reaction intermediate of photochemical reactions in atmosphere.

This change is generally a photochemical reaction of some sort, although other possibilities exist.

The higher temperatures also speed up the photochemical reactions that form ozone, the study says.

It only results from an electrochemical or photochemical reaction.

Be aware that this photochemical reaction is the basis of photographic film and paper.