Note: binding energy scale calibration of electron spectrometers for photoelectron spectroscopy using a single sample

Area of Science:

• Surface Science
• Materials Science
• Analytical Chemistry

Background:

• Accurate calibration of the binding energy scale is crucial for reliable photoelectron spectroscopy (PES) analysis.
• Traditional calibration methods often require sputter cleaning, which can alter sample surfaces and introduce artifacts.
• The need for a simpler, more efficient, and less destructive calibration technique is evident.

Purpose of the Study:

• To investigate the feasibility of calibrating the binding energy scale in PES using a single sample without sputter cleaning.
• To establish a straightforward and accurate method for binding energy scale calibration applicable to various materials.

Main Methods:

• Measurement of the Fermi level of a gold (Au) thin film.
• Utilized two distinct X-ray sources: monochromatic Al Kα (hν = 1486.7 eV) and He Iα (hν = 21.22 eV) for photoelectron spectroscopy.
• Compared measured binding energies with standard values defined in ISO 15472.

Main Results:

• A simple and accurate calibration of the binding energy scale was achieved using the single Au film sample.
• The method yielded binding energy values for Cu 2p(3/2), Ag 3d(5/2), and Au 4f(7/2) peaks.
• These values agreed with ISO 15472 standard values within ±0.02 eV, demonstrating high accuracy.

Conclusions:

• The proposed method offers a feasible, accurate, and efficient alternative for calibrating the binding energy scale in photoelectron spectroscopy.
• Eliminating the need for sputter cleaning simplifies the calibration process and preserves sample integrity.
• This technique is valuable for routine analysis and research requiring precise binding energy determination.