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Title: Experimental strategies for optical pump - Soft x-ray probe experiments at the LCLS
Authors: McFarland, B.K.Berrah, N.Bostedt, C.Bozek, J.Bucksbaum, P.H.Castagna, J.C.Coffee, R.N.Cryan, J.P.Fang, L.Farrell, J.P.Feifel, R.Gaffney, K.J.Glownia, J.M.Martinez, T.J.Miyabe, S.Mucke, M.Murphy, B.Natan, A.Osipov, T.Petrovic, V.S.Schorb, S.Schultz, T.Spector, L.S.Swiggers, M.Tarantelli, F.Tenney, I.Wang, S.White, J.L.White, W.Gühr, M.
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Issue Date: 2014
Published in: Journal of Physics: Conference Series Vol. 488 (2014)
Publisher: Bristol : Institute of Physics Publishing
Abstract: Free electron laser (FEL) based x-ray sources show great promise for use in ultrafast molecular studies due to the short pulse durations and site/element sensitivity in this spectral range. However, the self amplified spontaneous emission (SASE) process mostly used in FELs is intrinsically noisy resulting in highly fluctuating beam parameters. Additionally timing synchronization of optical and FEL sources adds delay jitter in pump-probe experiments. We show how we mitigate the effects of source noise for the case of ultrafast molecular spectroscopy of the nucleobase thymine. Using binning and resorting techniques allows us to increase time and spectral resolution. In addition, choosing observables independent of noisy beam parameters enhances the signal fidelity.
Keywords: Electrons; Molecular spectroscopy; Optical pumping; Probes; Scheduling; Beam parameter; Experimental strategy; Pump-probe experiments; Self-amplified spontaneous emission; Short pulse duration; Signal fidelity; Spectral range; Timing synchronization; Free electron lasers
DDC: 530
License: CC BY 3.0 Unported
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