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Highly efficient soft x-ray spectrometer for transient absorption spectroscopy with broadband table-top high harmonic sources

2021; AIP Publishing; Volume: 8; Issue: 3 Linguagem: Inglês

10.1063/4.0000096

2329-7778

Carlo Kleine, Maria Ekimova, Marc‐Oliver Winghart, Sebastian Eckert, Oliver Reichel, Heike Löchel, Jürgen Probst, Christoph Braig, Christian Seifert, A. Erko, Andréy Sokolov, M. J. J. Vrakking, Erik T. J. Nibbering, Arnaud Rouzée,

Mass Spectrometry Techniques and Applications

We present a novel soft x-ray spectrometer for ultrafast absorption spectroscopy utilizing table-top femtosecond high-order harmonic sources. Where most commercially available spectrometers rely on spherical variable line space gratings with a typical efficiency on the order of 3% in the first diffractive order, this spectrometer, based on a Hettrick-Underwood design, includes a reflective zone plate as a dispersive element. An improved efficiency of 12% at the N K-edge is achieved, accompanied by a resolving power of 890. The high performance of the soft x-ray spectrometer is further demonstrated by comparing nitrogen K-edge absorption spectra from calcium nitrate in aqueous solution obtained with our high-order harmonic source to previous measurements performed at the electron storage ring facility BESSY II.