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DF: Fachverband Dielektrische Festkörper
DF 9: Focus Session: Structural dynamics in photoexcited molecules
DF 9.2: Topical Talk
Wednesday, March 24, 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 Schaniel1,2 — 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<ON 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.