Beamline Introduction
The Soft X-ray scattering beamline of Shanghai Synchrotron Radiation Facility (SSRF) belongs to the soft branch of the energy materials research beamine (E-line) (BL20U2). It is one of the beamlines given birth by SSRF Beamlines Project (SSRF - Phase ll). It has passed CAS-process testing in October 2022 and is currently open to users. This branch beamine belongs to the E-line complex. It can operate completely independently as a soft X-ray beamline. It adopts an elliptical polarization oscillator (EPU60) as the light source and relies on a grating monochromator to deliver photons in the energy range of 130-150000eV to the experimental stations featured with soft X-ray scattering methods. These includes both inelastic methods such as Resonant Xray Emission (RXES) or Resonant Inelastic X-ray
Scattering (RIXS), and elastic methods such as Resonant Elastic X-ray Scattering (REXS) or Resonant Soft X-ray Scattering (RSOXS). These can be used to study electronic structures, e.g. fluorescence emission, charge transfer, d-d excitation etc or spatial structures, e.g. long-range orbital/spin/charge order, domain size/distribution for soft condensed matter (C.N,O) and inorganic materials including transition metals and rare earth, etc.
Fields of Application
Energy materials
Catalysts
Nano-materials
Smart materials
Soft materials
Engineering of the catalytic site d-band structure based on RIXS:
This section is discussing how a technique called Resonant Inelastic X-ray Scattering (RIXS) was used to study the electronic structure of a material. Specifically, they looked at the d-band structure of nickel atoms in different environments: Ni@C, I-Ni@C, and I-Ni. The d-band is a region of energy levels associated with electrons in the d orbitals of the nickel atom. By understanding the d-band str
The key findings were:
• The energy required for electrons to move from the valence band (filled energy levels) to the unoccupied states (empty energy levels) increased in the order Ni@C, I-Ni@C, and I-Ni.
• The d-band center of these materials decreased in the same order.
• The moderate d-band energy level of I-Ni@C at the nickel site helped to balance the adsorption and desorption capacity of key intermediates, which is important for catalytic reactions.
• The material I-Ni@C showed excellent performance as a catalyst for the hydrogen evolution reaction (HER) in alkaline conditions.
Revealing the periodic structure of the cholesteryl phase of liquid crystal polymer materials:
This section describes how RIXS was used to study the structure of a liquid crystal polymer material. Liquid crystals have properties of both liquids and crystals. The cholesteryl phase is a specific type of liquid crystal structure.
The researchers used RIXS to investigate the near-carbon absorption edge of the polymer-stabilized cholesteryl phase under different polarization conditions. They found a diffraction peak corresponding to a one-dimensional periodic structure of the cholesteryl phase. This periodic structure has a half-pitch of 2132.6 nanometers.
In simpler terms:
Section 2 is about using a special technique to understand how electrons behave in a material that can be used as a catalyst. Section 3 is about using the same technique to study the arrangement of molecules in a type of liquid crystal. Both sections highlight the power of RIXS in understanding the properties of materials at the atomic level.
Would you like me to explain any specific terms or concepts in more detail?
For example, I could go into more depth about what the d-band is, how RIXS works, or what the hydrogen evolution reaction is.
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