Femtosecond X-ray Absorption Spectroscopy οf a Light Driven Spin Crossover Process

C. Milnea, V.-T. Phama, W. Gaweldaa, c, A.E. Nahhasa, R.M. van der Veena, b, S.L. Johnsonb, P. Beaudb, G. Ingoldb, C. Borcab, D. Grolimundb, R. Abelab, M. Cherguia and Ch. Bresslerc a Laboratoire de Spectroscopie Ultrarapide (LSU), Ecole Polytechnique Fédérale de Lausanne, (EPFL), BSP, CH-1015 Lausanne, Switzerland, b Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland, c European XFEL GmbH, c/o DESY, Notkestrasse 85, D-22607 Hamburg, Germany

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Understanding the initial steps during ultrafast molecular reactions involving large spin state changes is a vital goal in structural dynamics research. These involve knowledge of the geometric structure of the system. Ultrafast X-ray absorption spectroscopy with 50-100 picosecond time resolution establishes the geometric structure of the short lived (τ = 0.6 ns) high spin state. Here we focus on time resolved X-ray absorption studies with 160-200 fs temporal resolution to monitor the structural evolution in this spin conversion: process.

DOI: 10.12693/APhysPolA.117.391 PACS numbers: 78.70.Dm, 75.30.Wx