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THBA02 |
Enabling Investigations of Fluids and Fluid - Solid - Interfaces With Soft X-Ray Excitation at UHV Conditions | |
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| Capturing biochemical markers by bio-molecular films is one of the most promising approaches for the development of highly sensitive and highly selective diagnosis. In particular, future innovative tools for in vitro or point of care diagnostics are expected to rely on this principle. Analytical techniques which can provide information on coverage, orientation and chemical state of biochemical films are capable of contributing to a purposeful development of such diagnostics. We present fluid cells, which were designed to facilitate the application of soft X-ray spectrometry for the in situ analysis of bio-molecular films at solid-liquid interfaces. It allows for - the analysis through a silicon nitride window with a thickness of about 150 nm - in situ preparation of successive layers by rinsing the window Currently, after the first successful soft X-ray experiments on liquids and gases, we are improving the versatility of the fluid cells. Spectrometry in transmission and in various emission geometries will be feasible. Also transmission- and emission-measurements in parallel are tested. Further control devices for the experimental conditions will be added. | ||
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Slides THBA02 [7.122 MB] | |
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MOPE35 |
A New Generation of UHV Instruments for X-Ray Spectrometry at the SR Facilities BESSY II, ELETTRA and SOLEIL and the BLiX Laboratory | |
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A versatile UHV instrument was developed and commissioned by GermanyÂs national metrology institute PTB for SR based X-Ray Reflectometry (XRR) and Spectrometry (XRS) nanoanalytical techniques at BESSY II*. A 9-axis manipulator allows for a sample alignment in all degrees of freedom and provides a rotational and translational movement of photodiodes as well as a translational movement of a beam-geometry defining aperture system. Traceable reference-free, total-reflection and grazing-incidence X-Ray Fluorescence (XRF) analyses were enabled with options for XRR and polarization-dependent X-ray absorption fine structure analyses on up to 100 mm samples aiming at compositional information, species and elemental depth profiles. Three technology transfer projects of adapted instruments enhanced XRS research activities within Europe at the SR facilities ELETTRA (IAEA)** and SOLEIL (CEA/LNE-LNHB) as well as at the X-ray innovation laboratory BLiX (TU Berlin)*** where different sources are used****. The expertise gained here lead to a next generation development enabling a very flexible use at four different SR beamlines for XRS and hard X-ray emission spectroscopy of up to 150 mm samples.
*J.Lubeck et al, Rev. Sci.Instr. 84, 045106(2013) **A.Karydas et al, IAEA/XRF/NL 24, 1(2013) ***M.Spanier et al, Rev. Sci.Instr. 87, 035108(2016) ****J.Lubeck et al, AIP Conf. Proc. 1741, 030011(2016) |
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