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A variety of photophysical and photochemical processes are common in Nature, and many different fields of research are dedicated to study them. Chromophores of various natures are exploited in different technologies,1  and some as chlorophylls are crucial in emblematic phenomena as the photosynthesis in plants and in different microorganisms. A crucial role is usually reserved to the environment, where photoactive species live. We define here as “environment” everything that is not directly, or “actively”, involved in the processes induced by the interaction with light. From a purely quantitative point of view, e.g., the molecular composition in terms of atoms, the environment is overwhelmingly bigger than the photoactive species, e.g., the p-coumaric acid embedded inside the photoactive yellow protein.

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