Abstract
A novel sample environment enabling optical pump – nuclear resonance probe experiments has been installed at the beamline P01, Petra III, DESY Hamburg. This set-up has been used to investigate optically induced spin state changes of spin crossover (SCO) complexes by nuclear resonant scattering immediately after excitation by an optical laser pulse. Here, we report the technical details as well as first results of the experiments performed at 290 K and 80 K on the SCO complexes [Fe (NH2trz)3]Cl2 and [Fe(PM-BiA)2(NCS)2], respectively. The 57Fe-enriched SCO complexes were excited by a 531 nm laser with a pulse length < 100 ps. Evaluation of the nuclear forward scattering data clearly indicate the presence of high spin (HS) states when the complexes are excited by laser pulses and a pure low spin (LS) state in the absence of any laser pulse. Furthermore, the dependence of the optically excited HS-fraction has been determined as a function of the average optical power.
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Acknowledgements
This work has been supported by the German Ministry of Research (BMBF) under 05K14UK1 and 05K16UKA and by the German Science foundation (DFG) via SFB/TRR 173 Spin + X (Project A4). We acknowledge support of the Helmholtz Association through project-oriented funds.
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This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2017), Saint-Petersburg, Russia, 3–8 September 2017
Edited by Valentin Semenov
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Sakshath, S., Jenni, K., Scherthan, L. et al. Optical pump - nuclear resonance probe experiments on spin crossover complexes. Hyperfine Interact 238, 89 (2017). https://doi.org/10.1007/s10751-017-1461-3
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DOI: https://doi.org/10.1007/s10751-017-1461-3