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Peak separation methods for inverse photoelectron spectra: Comparing second derivative, curve fitting, and
Ryotaro Nakazawa1, Haruki Sato1, Hiroyuki Yoshida1,2
1Graduate School of Engineering, Chiba University, Chiba 263-8522, Japan.
The Review of Scientific Instruments
|February 19, 2026
Summary
Low-energy inverse photoelectron spectroscopy (LEIPS) offers insights into unoccupied electronic states. This study compares peak separation methods for LEIPS spectra, crucial for analyzing overlapping peaks and improving spectral resolution.
Area of Science:
- Materials Science
- Surface Science
- Spectroscopy
Background:
- Inverse photoelectron spectroscopy (IPES) probes unoccupied electronic states.
- Low-energy IPES (LEIPS) minimizes sample damage but has lower resolution than PES.
- Low resolution in LEIPS leads to spectral broadening and overlapping peaks.
Purpose of the Study:
- To compare three peak separation methods for LEIPS spectra: second derivative, curve fitting, and deconvolution.
- To evaluate the performance, noise robustness, and peak separation capabilities of these methods.
- To provide a practical framework for LEIPS spectral analysis.
Main Methods:
- Application of second derivative, curve fitting, and deconvolution methods.
- Analysis of modeled and experimental LEIPS spectra of pentacene.
- Quantitative evaluation of methods based on parameters, noise, peak spacing, and intensity ratio.
Main Results:
- Systematic comparison of peak separation method performance.
- Evaluation of robustness to noise and peak separation capabilities.
- Demonstration of methods on pentacene's lowest unoccupied molecular orbital-derived band.
Conclusions:
- Established a practical framework for peak separation in LEIPS.
- The findings are applicable to photoelectron spectroscopy (PES) and other spectroscopies.
- Improved analysis of LEIPS spectra with overlapping peaks is achievable.
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