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Femtosecond spin-state photo-switching dynamics in an FeIII spin crossover solid accompanied by coherent structural vibrations

hal.structure.identifierInstitut de Physique de Rennes [IPR]
dc.contributor.authorBERTONI, Roman
hal.structure.identifierInstitut de Physique de Rennes [IPR]
dc.contributor.authorLORENC, Maciej
hal.structure.identifierInstitut de Chimie Moléculaire et des Matériaux d'Orsay [ICMMO]
dc.contributor.authorLAISNEY, Jerome
hal.structure.identifierInstitut de Chimie Moléculaire et des Matériaux d'Orsay [ICMMO]
dc.contributor.authorTISSOT, Antoine
hal.structure.identifierInstitut de Physique de Rennes [IPR]
dc.contributor.authorMORÉAC, Alain
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMATAR, Samir F.
hal.structure.identifierInstitut de Chimie Moléculaire et des Matériaux d'Orsay [ICMMO]
dc.contributor.authorBOILLOT, Marie-Laure
hal.structure.identifierInstitut de Physique de Rennes [IPR]
dc.contributor.authorCOLLET, Eric
dc.date.issued2015-05-05
dc.identifier.issn2050-7526
dc.description.abstractEnWe investigate light-induced excited spin-state trapping (LIESST) dynamics of an FeIII spin-crossover material from low (S=1/2) to high (S=5/2) spin states. Our results show that this process occurs only at the molecular level as evidenced by the linear dependence of the fraction of photo-switched molecules with the excitation density as well as with the initial fraction of low spin molecules. The inter-system crossing from photoexcited LS (S=1/2) to HS (S=5/2) occurs within 200 fs and is accompanied by coherent non-equilibrium vibrational relaxation in the photo-induced HS state. These results reveal similar dynamical features to those already reported for LIESST in FeII systems. The activation of coherent molecular vibrations is essential for reaching rapidly the HS potential on the timescale of molecular motions, whereas their fast damping allows an efficient trapping in the HS potential. The observed coherent oscillations are attributed to photoinduced molecules in the HS states, as supported by Raman spectroscopy at thermal equilibrium, and DFT analyses of molecular vibrations and TD-DFT calculations of optical absorption.
dc.description.sponsorshipEtude femtoseconde rayons X et optique de la dynamique ultrarapide de photocommutation de matériaux moléculaires magnétiques - ANR-13-BS04-0002
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.title.enFemtosecond spin-state photo-switching dynamics in an FeIII spin crossover solid accompanied by coherent structural vibrations
dc.typeArticle de revue
dc.identifier.doi10.1039/C5TC00854A
dc.subject.halPhysique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Materials Chemistry C
bordeaux.page7792-7801
bordeaux.volume3
bordeaux.issue30
bordeaux.peerReviewedoui
hal.identifierhal-01152947
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01152947v1
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