Photon-In/Photon-Out Soft X-ray Spectroscopy at the TPS 45A Beamline |
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| Authors: | C-L Dong J-W Chiou H-M Tsai H-W Fu H-J Lin CT Chen |
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| Institution: | 1. Department of Physics, Tamkang University, Tamsui, Taiwan;2. Department of Applied Physics, National University of Kaohsiung, Kaohsiung, Taiwan;3. National Synchrotron Radiation Research Center, Hsinchu, Taiwan |
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| Abstract: | Owing to the current energy crisis and extreme changes in the global climate, there is great interest in finding renewable energy resources. Vast progress has been made in the development of new materials related to renewable energy, and their physical/chemical properties can be tailored by nanostructuring and other advanced synthetic approaches. In many important energy systems, such as solar hydrogen systems, the atomic/electronic structures of materials and fundamental interfacial phenomena of systems critically determine the energy conversion efficiency of materials 1 S. Shen et al., Energy Environ. Sci. 9, 2744 (2016).Crossref], Web of Science ®] , Google Scholar], 2 J. Chen et al., J. Mater. Chem. A 2, 4605 (2014).Crossref], Web of Science ®] , Google Scholar]]. Without knowledge of the fundamental electronic structures of the materials during conversion reactions, better engineering of the material for practical use is difficult. Understanding and controlling the interfaces in energy generation/conversion/storage materials requires in-situ/operando approaches 3 V. Iablokov et al., Nano Lett. 12, 2091 (2012).Crossref], Web of Science ®] , Google Scholar], 4 F. Zheng et al., Nano Lett. 11, 847 (2011).Crossref], PubMed], Web of Science ®] , Google Scholar]]. The Taiwan Photon Source (TPS) Soft X-ray Spectroscopic beamline provides the capabilities for X-ray absorption (XAS) and X-ray emission (XES) spectroscopies, which can be utilized to investigate unoccupied (conduction-band) and occupied (valence-band) electronic states, respectively. Moreover, resonant inelastic X-ray scattering (RIXS) can be used to study intra-band (including d-d or f-f excitations) and inter-band (charge transfer) transitions 5 S. M. Butorin et al., Phys. Rev. Lett. 77, 574 (1996).Crossref], PubMed], Web of Science ®] , Google Scholar], 6 P. Kuiper et al., Phys. Rev. Lett. 80, 5204 (1988).Crossref], Web of Science ®] , Google Scholar]]. The former provides details about electronic energy splitting in various crystal fields and the latter involves electron transfer between a metal and a ligand, which determines chemical activity 7 H. Liu, Nano Lett. 7, 1919 (2007).Crossref], Web of Science ®] , Google Scholar], 8 V. Bisogni et al., Phys. Rev. Lett. 114, 096402 (2015).Crossref], Web of Science ®] , Google Scholar]]. |
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