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Spectroscopy Analysis

The characteristics and purposes of synchrotron-based spectroscopies, such as X-ray absorption spectroscopy (XAS), photoemission spectroscopy (PES) and infrared spectroscopy (IR), are described as follows:

X-ray Absorption Spectroscopy

X-ray Absorption Spectroscopy is typically divided into two regimes: the X-ray absorption near-edge structure (XANES) and the extended X-ray absorption fine structure (EXAFS) spectroscopy. XANES is strongly sensitive to oxidation state and coordination chemistry of the absorbing atom, while EXAFS is used to determine the bond length, coordination number, and species of the neighbors of the absorbing atom. Samples may be crystalline or amorphous, and in nearly any form (solid, liquid, gas, solution, mixture, etc.), and may be measured in situ under a variety of conditions.

Photoemission Spectroscopy

Photoemission Spectroscopy is a surface chemical and physical analysis techniques that can be used to measure the elemental composition, empirical formula, chemical state and electronic state of the elements that exist within a material. Using synchrotron radiation as the light source can provide many advantages, such as the tunability over a wide frequency range, high brilliance and polarization.

Infrared Spectroscopy

Infrared Spectroscopy is the absorption measurement of different IR frequencies by a sample positioned in the path of an IR beam. The main goal of IR spectroscopic analysis is to determine the chemical functional groups in the sample. The higher-energy near-IR can excite overtone or harmonic vibrations. The mid-infrared may be used to study the fundamental vibrations and associated rotational-vibrational structure. The far-infrared, lying adjacent to the microwave region, has low energy and may be used for rotational spectroscopy. Synchrotron radiation based IR microspectroscopy can not only provide considerable brightness advantages over conventional IR sources but also greatly improve the spatial resolution.

Methods Analysis Representative beamline
1.X-ray absorption spectroscopy
2.Extend X-ray absorption fine structure
3.X-ray absorption near edge structure
4.X-ray magnetic circular dichroism
● coordination number
● bonding length
● valence number
● the number of bond / angle
● spin / orbital moment
1.X-ray emission spectroscopy
2. X-ray photoelectron spectroscopy
3.X-ray fluorescence analysis
● atomic species content
● chemical state
● elements of composition and content
VUV emission / absorption spectroscopy ● circular dichroism
● Gas Analysis
● photoluminescence spectroscopy
Far-infrared spectroscopy Far-infrared imaging technique BL14A1