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Journal Article

Femtosecond X-Ray Scattering Study of Ultrafast Photoinduced Structural Dynamics in Solvated [Co(terpy)2]2+

MPS-Authors
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Britz,  Alexander
International Max Planck Research School for Ultrafast Imaging & Structural Dynamics (IMPRS-UFAST), Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
European XFEL GmbH, Albert-Einstein-Ring 19, D-22761 Hamburg, Germany;

External Resource
Fulltext (public)

PhysRevLett.117.013002_1.pdf
(Publisher version), 2MB

Supplementary Material (public)

SM.pdf
(Supplementary material), 2MB

Citation

Biasin, E., van Driel, T. B., Kjær, K. S., Dohn, A. O., Christensen, M., Harlang, T., et al. (2016). Femtosecond X-Ray Scattering Study of Ultrafast Photoinduced Structural Dynamics in Solvated [Co(terpy)2]2+. Physical Review Letters, 117(1): 013002. doi:10.1103/PhysRevLett.117.013002.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-7DA6-A
Abstract
We study the structural dynamics of photoexcited [Co(terpy)2]2+ in an aqueous solution with ultrafast x-ray diffuse scattering experiments conducted at the Linac Coherent Light Source. Through direct comparisons with density functional theory calculations, our analysis shows that the photoexcitation event leads to elongation of the Co-N bonds, followed by coherent Co-N bond length oscillations arising from the impulsive excitation of a vibrational mode dominated by the symmetrical stretch of all six Co-N bonds. This mode has a period of 0.33 ps and decays on a subpicosecond time scale. We find that the equilibrium bond-elongated structure of the high spin state is established on a single-picosecond time scale and that this state has a lifetime of ∼7  ps.