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Time zero determination for FEL pump-probe studies based on ultrafast melting of bismuth

DOI: 10.1063/1.4999701 DOI Help

Authors: S. W. Epp (Max Planck Institute for the Structure and Dynamics of Matter) , M. Hada (Okayama University) , Y. Zhong (Max Planck Institute for the Structure and Dynamics of Matter) , Y. Kumagai (Tohoku University) , K. Motomura (Tohoku University) , S. Mizote (Okayama University) , T. Ono (Tohoku University) , S. Owada (RIKEN SPring-8 Center) , Danny Axford (Diamond Light Source) , S. Bakhtiarzadeh (Max Planck Institute for the Structure and Dynamics of Matter; The Hamburg Centre for Ultrafast Imaging) , H. Fukuzawa (Tohoku University) , Y. Hayashi (Okayama University) , T. Katayama (RIKEN SPring-8 Center; Japan Synchrotron Radiation Research Institute) , A. Marx (Max Planck Institute for the Structure and Dynamics of Matter) , H. M. Müller-werkmeister (Max Planck Institute for the Structure and Dynamics of Matter) , R. L. Owen (Diamond Light Source) , Da. A. Sherrell (Diamond Light Source) , K. Tono (RIKEN SPring-8 Center; Japan Synchrotron Radiation Research Institute) , K. Ueda (Tohoku University) , F. Westermeier (Max Planck Institute for the Structure and Dynamics of Matter) , R. J. D. Miller (Max Planck Institute for the Structure and Dynamics of Matter; The Hamburg Centre for Ultrafast Imaging; University of Toronto)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Structural Dynamics , VOL 4

State: Published (Approved)
Published: September 2017

Open Access Open Access

Abstract: A common challenge for pump-probe studies of structural dynamics at X-ray free-electron lasers (XFELs) is the determination of time zero (T0)—the time an optical pulse (e.g., an optical laser) arrives coincidently with the probe pulse (e.g., a XFEL pulse) at the sample position. In some cases, T0 might be extracted from the structural dynamics of the sample's observed response itself, but generally, an independent robust method is required or would be superior to the inferred determination of T0. In this paper, we present how the structural dynamics in ultrafast melting of bismuth can be exploited for a quickly performed, reliable and accurate determination of T0 with a precision below 20 fs and an overall experimental accuracy of 50 fs to 150 fs (estimated). Our approach is potentially useful and applicable for fixed-target XFEL experiments, such as serial femtosecond crystallography, utilizing an optical pump pulse in the ultraviolet to near infrared spectral range and a pixelated 2D photon detector for recording crystallographic diffraction patterns in transmission geometry. In comparison to many other suitable approaches, our method is fairly independent of the pumping wavelength (UV–IR) as well as of the X-ray energy and offers a favorable signal contrast. The technique is exploitable not only for the determination of temporal characteristics of the experiment at the interaction point but also for investigating important conditions affecting experimental control such as spatial overlap and beam spot sizes.

Subject Areas: Technique Development, Physics


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