Ultrahigh-vacuum reaction apparatus to study synchrotron-radiation-stimulated processes

Area of Science:

• Materials Science
• Surface Science
• Physical Chemistry

Background:

• Synchrotron radiation (SR) offers unique properties for materials processing.
• Studying SR-stimulated processes requires specialized apparatus for in situ analysis.
• Previous methods lacked the capability for sequential, vacuum-maintained processing and analysis.

Purpose of the Study:

• To construct and evaluate an ultrahigh-vacuum (UHV) reaction apparatus for SR-stimulated processes.
• To enable successive SR-stimulated etching and chemical vapor deposition (CVD) without vacuum loss.
• To investigate the utility of in situ IR reflection absorption spectroscopy (IRRAS) and reflective high-energy electron diffraction (RHEED) for mechanism analysis.

Main Methods:

• Construction of a UHV reaction apparatus integrated with beamline 4B at UVSOR.
• Incorporation of IRRAS and RHEED for real-time surface analysis.
• Measurement of apparatus performance, including etching and deposition rates.

Main Results:

• The UHV apparatus successfully facilitated sequential SR-stimulated etching and CVD.
• Basic operational parameters such as etching and deposition rates were quantified.
• In situ IRRAS analysis proved effective for elucidating reaction mechanisms.

Conclusions:

• The developed UHV apparatus is a valuable tool for studying complex SR-stimulated surface processes.
• The combination of sequential processing and in situ diagnostics enables detailed mechanistic studies.
• IRRAS, particularly with buried metal layer substrates, is a powerful technique for analyzing SR-stimulated reactions.