Delayed Dissociation of Photoexcited Porphyrin Cations in a Storage Ring:  Determination of Triplet Quantum Yields

• Published in: The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Vol. 109; no. 17; pp. 3875 - 3879
• Main Authors: Nielsen, Christian B, Forster, James S, Ogilby, Peter R, Nielsen, Steen Brøndsted
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 05.05.2005
• Subjects: Cations; Chemistry, Physical - methods; Helium - chemistry; Ions; Light; Models, Chemical; Oxygen - chemistry; Photochemistry - methods; Photons; Porphyrins - chemistry; Quantum Theory; Singlet Oxygen - chemistry; Spectrometry, Mass, Electrospray Ionization; Time Factors

A technique is described wherein substituent-dependent excited-state properties of gas-phase porphyrins can be accurately quantified. Dissociation lifetimes of photoexcited porphyrin cations were measured in an electrostatic ion storage ring. From these data, upper limits for the triplet quantum yie...