Development of Scanning Transmission X-ray Microscopy for environmental control studies at TPS 27A

Hung Wei Shiu^1*, Yao-Jane Hsu¹, Der-Hsin Wei¹, Chia-Hao Chen¹, Hsiao-Tsu Wang², Way-Faung Pong²

¹Science division, National Synchrotron Radiation Research Center, Hsinchu, Taiwan
²Department of Physics, Tamkang University, Tamsui Dist., New Taipei City, Taiwan

* Presenter:Hung Wei Shiu, email:hwshiu@nsrrc.org.tw

The Scanning Transmission X-ray Microscopy (STXM) end-station located at national synchrotron radiation research center (NSRRC) is designed ideally to investigate small world in different fields, including material and environmental science, chemical and biological materials, energy materials and magnetism. High resolution and photon flux soft X-ray with the energy range from 90 to 3000 eV is focused down to 30 nm by the Fresnel zone plat and order sorting aperture (OSA) and then passes through the sample to be collected by the detector. With the xy sample scanning stages and the transmitted intensities, a pixel by pixel 2D image can be collected.

In our design, multiple X-ray absorption spectroscopy (XAS) imaging capabilities can be achieved, such as (1) transmission mode, (2) fluorescence yield, (3) total electron yield and (4) polarization controlled (XMCD/molecular orientation). Moreover, an ultra-high spatial resolution can also be can be achieved by using a lensless imaging technique so called “Ptychography” by replacing the point detector (PMT) by a CCD/CMOS 2D detector. Besides, multiple in situ environment cells will also be designed to fit different user’s requirements, for example, electrochemical cells, humidity cells, gas cells, heating cells and magnetic control systems. Technical capabilities, current status and scientific opportunities of the end-station will be reported.

Keywords: STXM, NEXAFS, in operando, spectromicroscopy