Despite all my searching, I cannot seem to come across any word to describe this process. The closest I can seem to come is dematerialisation, yet, in my opinion, this refers to the evanescence of matter rather than its expansion/dispersal/conversion into energy. I understand that the word used to describe this at a cellular level is respiration, the opposite of photosynthesis, yet I am looking for a single word more suited to describe it at a more microcosmic level. I am doing this out of personal interest rather than academic assignment. I would sincerely appreciate any help. I seem to have reached an impasse.