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/content/aca/journal/sdy/3/2/10.1063/1.4936290
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/content/aca/journal/sdy/3/2/10.1063/1.4936290
2015-11-20
2016-12-07

Abstract

We combine ultrafast optical spectroscopy with femtosecond X-rayabsorption to study the photo-switching dynamics of the [Fe(PM-AzA)(NCS)] spin-crossover molecular solid. The light-induced excited spin-state trapping process switches the molecules from low spin to high spin (HS) states on the sub-picosecond timescale. The change of the electronic state (<50 fs) induces a structural reorganization of the molecule within 160 fs. This transformation is accompanied by coherent molecular vibrations in the HS potential and especially a rapidly damped Fe-ligand breathing mode. The time-resolved studies evidence a delayed activation of coherent optical phonons of the lattice surrounding the photoexcited molecules.

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