Femtosecond X-ray Absorption Spectroscopy at a Hard X-ray Free Electron Laser: Application to Spin Crossover Dynamics

Henrik T. Lemke, Christian Bressler, Lin X. Chen, David M. Fritz, Kelly J. Gaffney, Andreas Galler, Wojciech Gawelda, Martin Kristoffer Haldrup, Robert W. Hartsock, Hyotcherl Ihee, Jeongho Kim, Kyung Hwan Kim, Jae Hyuk Lee, Martin Meedom Nielsen, Andrew B. Stickrath, Wenkai Zhang, Diling Zhu, Marco Cammarata

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

X-ray free electron lasers (XFELs) deliver short (<100 fs) and intense (similar to 10(12) photons) pulses of hard X-rays, making them excellent sources for time-resolved studies. Here we show that, despite the inherent instabilities of current (SASE based) XFELs, they can be used for measuring high-quality X-ray absorption data and we report femtosecond time-resolved X-ray absorption near-edge spectroscopy (XANES) measurements of a spin-crossover system, iron(II) tris(2,2'-bipyridine) in water. The data indicate that the low-spin to high-spin transition can be modeled by single-exponential kinetics convoluted with the overall time resolution. The resulting time constant is similar to 160 fs.
Original languageEnglish
JournalJournal of Physical Chemistry A
Volume117
Issue number4
Pages (from-to)735-740
ISSN1089-5639
DOIs
Publication statusPublished - 2013

Cite this

Lemke, H. T., Bressler, C., Chen, L. X., Fritz, D. M., Gaffney, K. J., Galler, A., Gawelda, W., Haldrup, M. K., Hartsock, R. W., Ihee, H., Kim, J., Kim, K. H., Lee, J. H., Nielsen, M. M., Stickrath, A. B., Zhang, W., Zhu, D., & Cammarata, M. (2013). Femtosecond X-ray Absorption Spectroscopy at a Hard X-ray Free Electron Laser: Application to Spin Crossover Dynamics. Journal of Physical Chemistry A, 117(4), 735-740. https://doi.org/10.1021/jp312559h