WinXAS is a user-friendly X-ray absorption spectroscopy (XAS) data-analysis program designed for MS-Windows 95/NT. It offers a graphical interface, supports multiple data formats, and includes advanced numerical algorithms for conventional XAS analysis. Key features include: 1. **Graphical Interface**: A user-friendly interface for visualizing and analyzing data, with the ability to process up to four spectra simultaneously. 2. **Data Handling**: Reads various ASCII file formats, stores data in binary format for efficiency, and supports data transfer in two-column ASCII format. 3. **Numerical Algorithms**: Provides algorithms for integrals, derivatives, roots, Fourier transformation, smoothing, and least-squares refinement of profile functions. 4. **Conventional XAS Analysis**: Offers tools for background subtraction, energy calibration, XANES profile fitting, and XAFS refinement. 5. **FEFF Interface**: Integrates with the ab-initio multiplescattering XAFS code FEFF, allowing users to perform XAFS analysis using theoretical phases and amplitudes. 6. **Time-Resolved Experiments**: Supports efficient data treatment for large sets of consecutive spectra, including macro recording and averaging. 7. **Energy-Dispersive XAS**: Includes routines for energy calibration and analysis of dispersive XAS data. WinXAS is particularly useful for online data examination during XAS experiments and for analyzing multiple-scan data, making it a valuable tool for both educational and research purposes.WinXAS is a user-friendly X-ray absorption spectroscopy (XAS) data-analysis program designed for MS-Windows 95/NT. It offers a graphical interface, supports multiple data formats, and includes advanced numerical algorithms for conventional XAS analysis. Key features include: 1. **Graphical Interface**: A user-friendly interface for visualizing and analyzing data, with the ability to process up to four spectra simultaneously. 2. **Data Handling**: Reads various ASCII file formats, stores data in binary format for efficiency, and supports data transfer in two-column ASCII format. 3. **Numerical Algorithms**: Provides algorithms for integrals, derivatives, roots, Fourier transformation, smoothing, and least-squares refinement of profile functions. 4. **Conventional XAS Analysis**: Offers tools for background subtraction, energy calibration, XANES profile fitting, and XAFS refinement. 5. **FEFF Interface**: Integrates with the ab-initio multiplescattering XAFS code FEFF, allowing users to perform XAFS analysis using theoretical phases and amplitudes. 6. **Time-Resolved Experiments**: Supports efficient data treatment for large sets of consecutive spectra, including macro recording and averaging. 7. **Energy-Dispersive XAS**: Includes routines for energy calibration and analysis of dispersive XAS data. WinXAS is particularly useful for online data examination during XAS experiments and for analyzing multiple-scan data, making it a valuable tool for both educational and research purposes.