ARpest

Angle Resolved Photoemission Electron Spectroscopy Tool

A modern, interactive GUI application for analysing ARPES (Angle-Resolved Photoemission Spectroscopy) data from multiple synchrotron beamlines. Coding or scripting is not needed.

Features

Core Capabilities

• Multi-beamline support: Load data from Diamond Light Source (I05) and MAX IV (Bloch)
• Multiple file formats: .nxs, .zip, .ibw
• 2D, 3D & 4D visualisation: Single cuts and photon energy/deflector angle scans
• Interactive visualisation: Real-time cursor tracking with live EDC/MDC updates
• Proces the data: Convert to k-space, correct the Fermi level based on a reference measurent etc.
• State management: Undo/redo functionality with complete processing history
• Analyse the data: Fit the process data
• Tabbed interface: Work with multiple datasets simultaneously
• Save dataset: Save and comeback where you where

Performance

• Optimized rendering for smooth visualisation
• Fast numpy slicing for data extraction
• In-place data updates

🎥 Live Demo

Watch real-time interaction with a 3D ARPES dataset: ➡️ https://github.com/OlaKenji/ARpest/wiki/Live-Demo

Installation

Requirements

• Python 3.7 or higher
• PyQt5
• NumPy
• SciPy
• h5py
• igor
• matplotlib
• pyqtgraph

Quick Install

# Install ARpest from PyPI
pip install arpest

# Launch the GUI
arpest

Usage

Basic Workflow

1. Launch the application:

   arpest
   

2. Configure settings:

   • Click ⚙️ Settings to set default data directory
   • Choose preferred colormap
   • Settings persist between sessions

3. Load data:

   • Click the 📂 Open File button in the toolbar
   • Select your ARPES data file (.nxs, .h5, .zip, or .ibw)

4. Interactive visualisation:

   • Click & drag: Continuously update cuts in real-time
   • 3D data: Use energy slider to navigate through different energy slices

5. Analyse and process the data:

   • Apply data processing: Convert to k-space, correct the Fermi level based on a reference measurent and more
   • Analyse by fitting the processed data: Fit EDC/MDC curves

Supported Beamlines

Diamond Light Source - I05

MAX IV - Bloch

Roadmap

• Additional beamline support (SLS, SOLEIL, etc.)
• Additional analysis methods

Contributing

Contributions are welcome! Please:

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

License

This project is licensed under the MIT License.

Citation

If you use ARpest in your research, please cite:

@software{arpest2025,
  author = {Ola Kenji Forslund},
  title = {ARpest: Interactive ARPES Data Analysis Tool},
  year = {2025},
  url = {https://github.com/OlaKenji/arpest}
}

Screenshots

3D Fermi Surface Mapping

Fermi surface with momentum cuts. Data from Phys. Rev. Lett. 134, 126602 (https://doi.org/10.1103/PhysRevLett.134.126602).