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-钍基核能物理中心-
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熔盐机械工程技术部 |
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仪控工程技术部 |
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熔盐化学工程技术部 |
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-核能综合利用研究中心-
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材料研究部 |
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钍铀循环化学部 |
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应用化学技术部 |
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氚科学与工程技术部 |
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核与辐射安全技术部 |
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应用加速器技术部 |
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反应堆运行技术部 |
报告题目:New directions for in-situ and operando studies of soft matter systems through core-level spectroscopies (XAS, XPS, XRS, RIXS) of low-Z elements
报 告 人:Prof. Sven L. M. Schroeder
School of Chemical and Process Engineering, University of Leeds, UK;
DIAMOND Light Source Ltd., Harwell Science and Innovation Campus, UK
报告时间:2017年12月15日 下午2点半
报告地点:张江科研楼102室
Abstract:
The emergence of ambient pressure operation technologies is opening up core level spectroscopies to new analytical applications. Starting from the use of soft X-ray spectroscopies for studies of pharmaceutical dosage forms, I will highlight a range of new applications in the context of organic materials and formulated product characterisation, including crystalline powder processing, origins of variations in drug bioavailability and interfacial processes related to the stability of formulated products. I will show how X-ray photoelectron spectroscopy (XPS) readily distinguishes proton transfer from H-bonding in organic materials, complementing X-ray diffraction and solid-state NMR methods. Combined XPS and near-edge X-ray absorption fine-structure (NEXAFS) measurements are readily linked with density functional theory (DFT) to provide reliable and highly precise understanding of intermolecular bonding in condensed matter. There is a vast range of potential uses for studying the local chemical and structural environment in solutions, for example to characterise nucleation processes and quantitative bond length determination based on NEXAFS σ* shape resonance analysis. In combination with computational modelling by DFT incisive analysis of solute-solvent and solute-solute interactions can be achieved, which can be further enhanced by complementary resonant and non-resonant X-ray scattering analysis of core level states.
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