Official Resources
- Homepage: https://github.com/skelton-group/Phonopy-Spectroscopy
- GitHub: https://github.com/skelton-group/Phonopy-Spectroscopy
- Documentation: GitHub README and examples
- License: MIT License
Overview
Phonopy-Spectroscopy is a Python package that extends Phonopy to simulate infrared (IR) and Raman spectra of crystalline materials. It calculates IR intensities from Born effective charges and Raman activities from polarizability tensors computed using VASP, enabling direct comparison with experimental vibrational spectra.
Scientific domain: IR spectroscopy, Raman spectroscopy, phonons
Target user community: Materials scientists studying vibrational properties
Theoretical Methods
- Phonon frequencies (via Phonopy)
- Born effective charge tensors
- Dielectric polarizability tensors
- IR intensity calculation
- Raman activity calculation
- Symmetry analysis
Capabilities (CRITICAL)
- IR Spectra: Infrared intensities from Born charges
- Raman Spectra: Raman activities from polarizabilities
- Phonopy Integration: Uses Phonopy phonon modes
- VASP Interface: Reads VASP output directly
- Peak Broadening: Lorentzian/Gaussian functions
- Symmetry: Irreducible representation assignment
Sources: Phonopy-Spectroscopy GitHub, Skelton group publications
Key Strengths
Phonopy Ecosystem:
- Built on Phonopy
- Consistent workflow
- Validated methodology
- Active maintenance
VASP Workflow:
- Direct VASP integration
- Born charges (LEPSILON)
- Raman from DFPT
- Standard DFT inputs
Complete Spectra:
- IR and Raman
- Peak assignment
- Symmetry labels
- Publication ready
Inputs & Outputs
-
Input formats:
- Phonopy FORCE_SETS
- VASP OUTCAR (Born charges)
- VASP polarizability calculations
-
Output data types:
- IR spectrum data
- Raman spectrum data
- Mode assignments
- Visualization files
Installation
pip install phonopy-spectroscopy
# Or from source
git clone https://github.com/skelton-group/Phonopy-Spectroscopy.git
cd Phonopy-Spectroscopy
pip install -e .
Usage Examples
# Calculate IR spectrum
phonopy-ir POSCAR --born BORN --fc FORCE_CONSTANTS
# Calculate Raman spectrum
phonopy-raman POSCAR --raman-tensors tensors.yaml --fc FORCE_CONSTANTS
# Python API
from spectroscopy import calculate_ir_spectrum
spectrum = calculate_ir_spectrum(phonopy_obj, born_charges)
Performance Characteristics
- Speed: Fast post-processing
- Memory: Minimal requirements
- Dependencies: Requires Phonopy and DFT data
Limitations & Known Constraints
- VASP focused: Primarily for VASP users
- Phonopy required: Needs Phonopy installation
- DFPT needed: Requires response calculations
- Harmonic: No anharmonic effects
Comparison with Other Tools
- vs THeSeuSS: Different implementations
- vs native DFT: More automated workflow
- vs experiment: Direct comparison enabled
- Unique strength: Phonopy integration, VASP workflow
Application Areas
- Materials characterization
- Phase identification
- Catalyst analysis
- Mineral spectroscopy
- Polymer identification
Best Practices
- Ensure phonon convergence first
- Use LEPSILON for Born charges
- Check symmetry assignments
- Compare with experimental spectra
Community and Support
- GitHub repository
- Skelton group (University of Manchester)
- MIT licensed
- Active development
Verification & Sources
Primary sources:
- GitHub: https://github.com/skelton-group/Phonopy-Spectroscopy
- Skelton group publications
Confidence: VERIFIED
Verification status: ✅ VERIFIED
- GitHub repository: ACCESSIBLE
- Documentation: AVAILABLE
- Source code: OPEN (MIT)
- Method: IR/Raman from Phonopy