MARINO, Andrea; CAMMARATA, Marco; MATAR, Samir F.; LÉTARD, Jean-François; CHASTANET, Guillaume; CHOLLET, Matthieu; GLOWNIA, James Michael; LEMKE, Henrik T.; COLLET, Eric

doi:10.1063/1.4936290

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MARINO, Andrea
Institut de Physique de Rennes [IPR]

CAMMARATA, Marco
Institut de Physique de Rennes [IPR]

MATAR, Samir F.
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Structural Dynamics. 2016, vol. 3, n° 2, p. 023605 (15 p.)

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Resumen en inglés

We combine ultrafast optical spectroscopy with femtosecond X-ray absorption to study the photo-switching dynamics of the [Fe(PM-AzA)2(NCS)2] 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.< Leer menos

DOI

http://dx.doi.org/10.1063/1.4936290

Proyecto ANR

Etude femtoseconde rayons X et optique de la dynamique ultrarapide de photocommutation de matériaux moléculaires magnétiques - ANR-13-BS04-0002

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Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026