Azobenzene is one of the best-known molecules that can be switched between two forms by light. However, the question of how the molecule moves in the first few picoseconds (trillionths of a second) after it absorbs light has remained unresolved for nearly 50 years.

Source: [Phys.org](https://phys.org/news/2026-10-ultrafast-rays-reveal-responsive-molecular.html)

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