From its robust Shirley background subtraction and flexible peak constraint system to its support for asymmetric peak functions and multiple data formats, XPS Peak Fit 4.1 is a reliable workhorse for any materials lab. While paid software like CasaXPS offers more automation and larger databases, the freeware's simplicity, ease of use, and zero cost make it an unbeatable choice for students, researchers in smaller labs, or anyone needing to perform quick, accurate, and publication-ready XPS analysis.
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If you need help resolving installation issues or want to learn how to set up specific peak constraints for your data, let me know. Please share: Your (Windows 10, 11, etc.)
| Problem | Likely Cause | Solution | | :--- | :--- | :--- | | "DLL missing" error | Visual C++ Redistributable not installed | Download VC++ 2015-2022 from Microsoft. | | Software crashes when opening large files | Insufficient memory allocation | Go to Settings > Memory and increase cache to 4096 MB. | | Peaks won't converge | Poor initial guess for FWHM | Start all FWHM values at 1.0 eV for metals and 1.3 eV for polymers. | | Demo version watermarks on graphs | Using unlicensed version | Purchase license or request academic extension. | | Cannot import .xps files from PHI instruments | Missing file parser | Update to the latest hotfix (v41.2) from the support portal. | xps peak fit 41 new download
Because of the security risks associated with downloading old executables from unknown "file hosting" sites, most surface analysis labs now recommend moving to open-source or actively maintained alternatives (see Section 4).
is a specialized, lightweight Windows application designed for visualizing and fitting X-ray Photoelectron Spectroscopy (XPS) data. Originally developed by Raymund Kwok, it remains a popular freeware choice for researchers and students due to its straightforward interface and essential fitting capabilities. Core Features for Peak Analysis
Save your parameters in the native .xps file format so you can edit your work later. Use the export functions to save the raw data, background data, and individual peak component data to plot them into professional graphing software. From its robust Shirley background subtraction and flexible
: The program often runs directly from its executable ( XPSPEAK41.exe ) without a traditional installation process, making it highly portable. Pro Tips for Better Peak Fitting
Title: XPS PeakFit 4.1 — New Release Available for Download
orbitals which require specific spin-orbit doublet splitting rules). For doublet peaks (like This link or copies made by others cannot be deleted
After fitting, export the peak parameters to a .par file. For a given element, sum the areas of all component peaks belonging to that element. Then divide each component’s area by the appropriate relative sensitivity factor (RSF) for that element. Compare normalized areas across elements to obtain atomic percentages.
This is the core step where your knowledge of the sample’s chemistry comes into play.
Right-click and choose "Extract" or open the cabinet file to extract all the necessary files into a new, dedicated folder (e.g., C:\XPSPEAK ).
XPS Peak Fit is a specialized software designed for the analysis of XPS spectra. It allows users to fit peaks into their spectra, which is crucial for interpreting the chemical composition of materials.
Master XPS Peak Fitting with the All-New XPS Peak Fit 41 Download