Journal
PHYSICAL REVIEW LETTERS
Volume 113, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.227402
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Funding
- Institut Universitaire de France, Rennes Metropole, Region Bretagne [CREATE 4146]
- ANR [ANR-13-BS04-0002]
- Centre National de la Recherche Scientifique (CNRS) (PEPS SASLELX)
- Fonds Europeen de Developpement Regional (FEDER)
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We study the basic mechanisms allowing light to photoswitch at the molecular scale a spin-crossover material from a low-to a high-spin state. Combined femtosecond x-ray absorption performed at LCLS X-FEL and optical spectroscopy reveal that the structural stabilization of the photoinduced high-spin state results from a two step structural trapping. Molecular breathing vibrations are first activated and rapidly damped as part of the energy is sequentially transferred to molecular bending vibrations. During the photoswitching, the system follows a curved trajectory on the potential energy surface.
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