Talk by Dr. Rajendra Prasad Giri on "Synchrotron X-ray scattering and optical pump – X-ray probe measurements from liquid surfaces and interfaces" | Shiv Nadar University
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Talk by Dr. Rajendra Prasad Giri on "Synchrotron X-ray scattering and optical pump – X-ray probe measurements from liquid surfaces and interfaces"

Structural and dynamical properties of surfaces and interfaces are of pivotal importance for the elucidation of surface phenomena. For example, interaction of exogenous molecules with biomembranes and chemical reactions at interfaces are influenced by these properties. In this regard, X-ray and neutron scattering techniques are unique methods for the study of variety of systems ranging from solids to liquids. Our study deals with the self-assembly, adsorption and intercalation

of flat planar macromolecules, specifically hemin into soft biomembranes. In addition, optical pump – X-ray probe measurements have been performed from liquid-vapour interface using LISA diffractometer [1], for the first time, installed at P08 beamline at the PETRA III synchrotron radiation source in Hamburg. The diffractometer is specialized for hard X-ray scattering studies of liquid surfaces and interfacesHere, we also describe the extension of this instrument’s capabilities by an optical pump - X-ray probe option, which will allow investigations of ultrafast processes at liquid interfaces. First obtained results from pump - probe X-ray reflectivity experiments at the liquid - air interface has confirmed a time resolution of even better than 100ps. These new capabilities provide access to structural changes induced via optical excitation, allowing us to understand the non-equilibrium

processes on liquid interfaces such as water and mercury. Results obtained from the mercury-vapour interface will be presented here. In addition, results from the interaction of flat

planar hemin molecules with model biomembranes [2], studied through a combination of synchrotron-based X-ray scattering techniques, Langmuir monolayer measurements and molecular dynamics simulation, will also be discussed here

Event Date: 
Tuesday, March 26, 2019 - 12:00Wednesday, March 27, 2019 - 01:00

Speaker:  Dr.  Rajendra Prasad Giri

                 Post-Doctoral Fellow, Institute for Experimental and Applied Physics, Cristian-Albrechts-University Kiel, Germany

Tuesday 26, Mar 2019 - Wednesday 27, Mar 2019
12:00 PM - 01:00 AM
B-012, Ground floor

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