XPSpeak 4.1 is a free, lightweight Windows application developed by Dr. Raymund Kwok for the analysis and peak fitting of X-ray Photoelectron Spectroscopy (XPS) data. It is widely used in materials science for deconvoluting complex spectra to identify elemental compositions and chemical states. Core Capabilities
mentions that the zipped setup file is roughly 3.3MB and was originally designed for Windows 95/98, though it typically runs on newer Windows versions in compatibility mode. Washington State University Key Installation & Usage Tips Compatibility xpspeak41 software download
Check Internet Archive – archive.org/details/software sometimes hosts old radio CDs. XPSpeak 4
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