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Pascal Classification Scheme

001 Exact sciences and technology.
- 001A Sciences and techniques of general use.
- 001B Physics
  - 001B00 General.
  - 001B10 The physics of elementary particles and fields.
  - 001B20 Nuclear physics.
  - 001B30 Atomic and molecular physics.
    - 001B30A Electronic structure of atoms, molecules and their ions: theory.
    - 001B30B Atomic properties and interactions with photons.
    - 001B30C Molecular properties and interactions with photons.
      - 001B30C15 Properties of molecules and molecular ions.
      - 001B30C20 Molecular spectra.
      - 001B30C25 Nuclear resonance and relaxation.
      - 001B30C35 Electron resonance and relaxation.
      - 001B30C40 Multiple resonances (including double and higher-order resonance processes, such as double nuclear magnetic resonance, electron double resonance and microwave optical double resonance).
      - 001B30C45 Mössbauer spectra.
      - 001B30C50 Fluorescence and phosphorescence; radiationless transitions, quenching (intersystem crossing, internal conversion).
      - 001B30C55 Optical activity and dichroism; magnetooptical and electrooptical spectra.
      - 001B30C60 Photoelectron spectra.
      - 001B30C70 Intensities and shapes of molecular spectral lines and bands.
      - 001B30C80 Photon interactions with molecules.
        
        001B30C80B Level crossing and optical pumping.
        
        001B30C80E Autoionization, photoionization, and photodetachment.
        
        001B30C80G Diffuse spectra; predissociation, photodissociation.
        
        001B30C80P Optical cooling of molecules; trapping.
        
        001B30C80R Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states).
        
        001B30C80W Other multiphoton processes.
      - 001B30C90 Other topics in molecular properties and interactions with photons.
    - 001B30D Atomic and molecular collision processes and interactions.
    - 001B30F Studies of special atoms, molecules and their ions; clusters.
    - 001B30G Mechanical control of atoms, molecules and ions.
  - 001B40 Fundamental areas of phenomenology (including applications).
  - 001B50 Physics of gases, plasmas and electric discharges.
  - 001B60 Condensed matter: structure, mechanical and thermal properties.
  - 001B70 Condensed matter: electronic structure, electrical, magnetic, and optical properties.
  - 001B80 Cross-disciplinary physics: materials science; rheology.
- 001C Chemistry.
- 001D Applied sciences.
- 001E Earth, ocean, space.
002 Biological and medical sciences.

Francis Classification Scheme