A scanning transmission X-ray microscope at the Pohang Light Source

Area of Science:

• Materials Science
• Physics
• Chemistry

Background:

• Soft X-ray microscopy enables elemental and chemical state analysis.
• Advancements in beamline technology are crucial for high-resolution imaging.

Purpose of the Study:

• To report the operational status and capabilities of a new scanning transmission X-ray microscope (STXM).
• To detail the hardware setup and initial applications of the STXM at the Pohang Light Source.

Main Methods:

• Utilized a scanning transmission X-ray microscope (STXM) at the 10A beamline, employing soft X-rays (150-1600 eV).
• Implemented zone plates for diffraction-limited resolution (~30 nm) and soft X-ray fluorescence for thicker samples (~50 nm).
• Incorporated a ptychography setup to achieve enhanced spatial resolution (~10 nm).

Main Results:

• Achieved a spatial resolution of approximately 30 nm using a 25 nm zone plate up to ~850 eV.
• Demonstrated elemental, chemical state, and magnetic moment mapping for thin samples via absorption spectroscopy.
• Provided elemental and chemical state information for thicker samples with ~50 nm resolution using fluorescence detection.
• Improved spatial resolution to ~10 nm with the ptychography setup.

Conclusions:

• The new STXM at the 10A beamline is fully operational, providing versatile nanoscale imaging capabilities.
• The implemented techniques offer powerful tools for materials characterization, elemental distribution, and chemical state analysis.
• The STXM system facilitates advanced research across various scientific disciplines requiring high-resolution soft X-ray microscopy.