Photoinduced rotamerization and dissociation of o-fluorobenzoyl chloride in solid Ar

- Infrared spectrum of o-fluorobenzoyl chloride (FBC) was measured in solid Ar.
- Upon UV irradiation, the rotamerization from anti- to gauche-FBC was confirmed.
- Isomerization to 6-chloro-2-fluoro-2,4-cyclohexadien-1-ylidenemethanone was observed.
- Prolonged UV irradiation resulted in the formation of o-chlorofluorobenzene and CO.