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A bidirectional scanning method for scanning transmission X-ray microscopy.

Tianxiao Sun1, Xiangzhi Zhang1, Zijian Xu1

  • 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China.

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Summary

A new S-shaped bidirectional scanning method for scanning transmission X-ray microscopy (STXM) eliminates motor backlash. This innovation enhances imaging efficiency and resolution for STXM experiments.

Keywords:
S-trackSSRFSTXMbidirectional scanning methodspost-processing

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Area of Science:

  • Materials Science
  • Microscopy Techniques
  • Synchrotron Radiation Applications

Background:

  • Scanning transmission X-ray microscopy (STXM) performance is critically dependent on scanning mode.
  • Existing scanning methods face limitations due to motor backlash and vibrations, impacting imaging efficiency and resolution.

Purpose of the Study:

  • To develop and implement an advanced bidirectional scanning method for STXM.
  • To overcome limitations of conventional scanning techniques, specifically motor backlash and vibration.
  • To enhance the overall performance and data acquisition efficiency of STXM.

Main Methods:

  • A novel S-shaped bidirectional scanning track was designed and controlled using ramp waves generated by a piezo-stage controller.
  • Sample position data were acquired using laser interferometric sensors and processed by a field-programmable gate array (FPGA) board.
  • X-ray signals were simultaneously acquired by the detector, and data with real position information were recorded by the FPGA.
  • An adapted post-processing program was utilized to re-mesh the data and obtain high-resolution STXM images.

Main Results:

  • The S-track bidirectional scanning method was successfully implemented on the STXM endstation at the Shanghai Synchrotron Radiation Facility (SSRF).
  • The method effectively eliminated the influence of motor backlash and vibration on STXM images.
  • High-resolution STXM imaging successfully resolved a ∼30 nm interval between the innermost strips of a Siemens star sample.
  • Significant improvements in STXM experimental efficiency were demonstrated.

Conclusions:

  • The developed S-track bidirectional scanning method significantly improves STXM performance by eliminating backlash and vibration.
  • This method enhances imaging efficiency and enables the acquisition of high-resolution STXM data.
  • The successful implementation at SSRF validates the method's effectiveness for advanced microscopy applications.