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DF: Fachverband Dielektrische Festkörper

DF 9: Focus Session: Structural dynamics in photoexcited molecules

DF 9.2: Topical Talk

Mittwoch, 24. März 2010, 10:40–11:00, H11

Ultrafast reversible photogeneration of nitrosyl linkage isomers in Na₂[Fe(CN)₅NO]2H₂O — •Matthieu Nicoul¹, Theo Woike¹, and Dominik Schaniel^1,2 — ¹I. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany — ²CRM2, Université de Nancy, Nancy, France

We report on the photogeneration of nitrosyl linkage isomers in single crystals of sodium nitroprusside Na₂[Fe(CN)₅NO]2H₂O. Using pump-probe spectroscopy with a time-resolution of 160 fs we show that the photoinduced NO rotation from a linearly bound ground state Fe-N-O to a side-on bound Fe<_O^N is completed within 1.5 ps. The relaxation after photoexcitation is mono-exponential with a time constant of 300(20) fs, indicating that during the NO rotation no intermediate state with lifetimes longer than 100 fs exists.