Materials Project Documentation
Return to materialsproject.org
  • Introduction
  • Frequently Asked Questions (FAQ)
    • Glossary of Terms
  • Changes and Updates
    • Database Versions
    • Website Changelog
  • Documentation Credit
  • Community
    • Getting Help
    • Getting Involved
      • Contributor Guide
      • Potential Collaborators
      • MP Community Software Ecosystem
    • Community Resources
    • Code of Conduct
  • Services
    • MPContribs
  • Methodology
    • Materials Methodology
      • Overview
      • Calculation Details
        • GGA/GGA+U Calculations
          • Parameters and Convergence
          • Hubbard U Values
          • Pseudo-potentials
        • r2SCAN Calculations
          • Parameters and Convergence
          • Pseudopotentials
      • Thermodynamic Stability
        • Energy Corrections
          • Anion and GGA/GGA+U Mixing
          • GGA/GGA+U/r2SCAN Mixing
        • Phase Diagrams (PDs)
        • Chemical Potential Diagrams (CPDs)
        • Finite Temperature Estimation
      • Electronic Structure
      • Phonon Dispersion
      • Diffraction Patterns
      • Aqueous Stability (Pourbaix)
      • Magnetic Properties
      • Elastic Constants
      • Piezoelectric Constants
      • Dielectric Constants
      • Equations of State (EOS)
      • X-ray Absorption Spectra (XAS)
      • Surface Energies
      • Grain Boundaries
      • Charge Density
      • Suggested Substrates
      • Related Materials
      • Optical absorption spectra
      • Alloys
    • Molecules Methodology
      • Overview
      • Calculation Details
      • Atomic Partial Charges
      • Atomic Partial Spins
      • Bonding
      • Metal Coordination and Binding
      • Natural Atomic and Molecular Orbitals
      • Redox and Electrochemical Properties
      • Molecular Thermodynamics
      • Vibrational Properties
      • Legacy Data
    • MOF Methodology
      • Calculation Parameters
        • DFT Parameters
        • Density Functionals
        • Pseudopotentials
        • DFT Workflow
  • Apps
    • Explore and Search Apps
      • Materials Explorer
        • Tutorial
      • Molecules Explorer
        • Tutorial
        • Legacy Data
      • Battery Explorer
        • Background
        • Tutorial
      • Synthesis Explorer
        • Background
        • Tutorial
      • Catalysis Explorer
        • Tutorial
      • MOF Explorer
        • Downloading the Data
        • Structure Details
          • QMOF IDs
          • Structure Sources
          • Finding MOFs by Common Name
          • Structural Fidelity
        • Property Definitions
          • SMILES, MOFid, and MOFkey
          • Pore Geometry
          • Topology
          • Electronic Structure
          • Population Analyses and Bond Orders
          • Symmetry
        • Version History
        • How to Cite
    • Analysis Apps
      • Phase Diagram
        • Background
        • Tutorials
        • FAQ
      • Pourbaix Diagram
        • Background
        • Tutorial
        • FAQ
      • Crystal Toolkit
        • Background
        • Tutorial
        • FAQ
      • Reaction Calculator
      • Interface Reactions
    • Characterization Apps
      • X-ray Absorption Spectra (XAS)
    • Explore Contributed Data
  • Downloading Data
    • How do I download the Materials Project database?
    • Using the API
      • Getting Started
      • Querying Data
      • Tips for Large Downloads
      • Examples
      • Advanced Usage
    • Differences between new and legacy API
    • Query and Download Contributed Data
    • AWS OpenData
  • Uploading Data
    • Contribute Data
  • Data Production
    • Data Workflows
    • Data Builders
Powered by GitBook
On this page

Was this helpful?

Edit on GitHub
Export as PDF
  1. Methodology
  2. Molecules Methodology

Atomic Partial Spins

How partial spins for open-shell molecules are determined in MPcules

Atomic partial spins can be defined similarly to atomic partial charges for molecules with unpaired electrons ("open-shell" molecules; "closed-shell" molecules with no upaired electrons have 0 net spin and therefore 0 partial spin on each atom, by definition). We currently calculate atomic partial spins using two methods: Mulliken population analysis [1] and natural atomic populations from NBO [2, 3]. While Mulliken partial charges can be unreliable, we have generally found that Mulliken partial spins are qualitatively similar to those obtained from NBO and can therefore be treated without prejudice.

References

  1. Mulliken, R.S., 1955. Electronic population analysis on LCAO–MO molecular wave functions. I. The Journal of chemical physics, 23(10), pp.1833-1840.

  2. Glendening, E.D., Badenhoop, J.K., Reed, A.E., Carpenter, J.E., Bohmann, J.A., Morales, C.M., Karafiloglou, P., Landis, C.R., Weinhold, F., 2018. NBO 7.0. Theoretical Chemistry Institute, University of Wisconsin, Madison.

  3. Glendening, E.D., Landis, C.R. and Weinhold, F., 2012. Natural bond orbital methods. Wiley interdisciplinary reviews: computational molecular science, 2(1), pp.1-42.

PreviousAtomic Partial ChargesNextBonding

Last updated 1 year ago

Was this helpful?