Open AccessActivation of coherent lattice phonon following ultrafast molecular spin-state photo-switching: A molecule-to-lattice energy transfer
Author(s) -
Andrea Marino,
Marco Cammarata,
Samir F. Matar,
J.-F. Létard,
Guillaume Chastanet,
M. Chollet,
James M. Glownia,
H. Lemke,
Éric Collet
Publication year - 2015
Publication title -
structural dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.415
H-Index - 29
ISSN - 2329-7778
DOI - 10.1063/1.4936290
Subject(s) - spin crossover , femtosecond , phonon , picosecond , excited state , spin states , spectroscopy , ultrashort pulse , molecule , molecular physics , materials science , condensed matter physics , atomic physics , chemistry , laser , physics , optics , organic chemistry , quantum mechanics
International audienceWe 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 (LIESST) process switches the molecules from low spin (LS) 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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