# PlanetPhysics/Spectroscopy Topics

*Spectroscopy* is broadly described as a field in physics concerned with
recording of spectra, ranging from gamma to X-rays, neutrons, UV, visible, NIR, IR, microwaves, radio frequency, ultrasound, acoustic waves, gravitational, etc.

This is a contributed topic on spectroscopy themes and underlying concepts and theories.

- Electrical fields
- magnetic fields
- Electromagnetic fields and waves
- Biot-Savart equations
- Maxwell's equations
- vector calculus in electrostatics
- Vector and scalar potentials
- Kramers-Kronig relations
- Stokes theorem
- Laplace equation
- Poisson equation
- Einstein's GR equations
- Planck's equation
- Polarization
- Polarizability
- Poynting vector
- Reflection spectroscopy (NIR, vis, electron, etc.)
- Transmission spectroscopy (vis/UV, NIR/IR, etc.)
- Polarized IR and Polarized NIR
- Vibrational Circular Dichroism (
*VCD*) - Absorption spectroscopy (vis/UV, NIR/IR, NMR, EPR/ESR, FMR etc.)
- Spectroscopy and spectrophotometry
- Coherent spectroscopy of atoms and molecules
- Electron spectroscopy (x-ray photoelectron (XPS), Auger electron spectroscopy (AES), and so on)
- EXAFS and X-ray spectroscopy
- Neutron spectroscopy
- M\"ossbauer spectroscopy
- Infrared and Raman spectroscopy
- Hyperspectral (NIR, IR, UV/vis) imaging
- Microspectroscopy
- Fluorescence Correlation Spectroscopy (
*FCS*) - Fresnel equations
- Diffraction equations
- Electric dipoles
- Dipole-dipole interactions
- dipole-induced dipole interactions
- Ion-dipole interactions
- London dispersion forces
- Yang-Mills equations
- Yang-Baxter equations
- Quantum Yang-Baxter equations
- Total intermolecular pair potentials
- Optical constants
- Extinction coefficient
- Refraction and reflection coefficients
- Total internal reflection
- Derivation of the Kramers-Kronig relations
- Lorentz model
- AC and DC conductivity
- Displacement
- Skin depth