- High-Resolution Inelastic X-ray Scattering (IXS):
Of the many flavors of IXS, this particular method is used to study vibrational excitations (phonons) in materials in the frequency/energy domain. For more information, and the state-of-the-art around the world, see Introduction to High-Resolution Inelastic X-Ray Scattering.
- X-ray Photon Correlation Spectroscopy (XPCS):
XPCS measures dynamics in materials by analyzing intensity correlations of coherent scattering patterns (speckles). For more information, see The X-ray Correlation Spectroscopy instrument at Linac Coherent Light Source.
- Resonant Inelastic X-ray Scattering (RIXS):
This element and orbital specific thechnique is predominantly useful in investigating electronic excitations in quantum materials. This review article would be a good start: Resonant Inelastic X-ray Scattering Studies of Elementary Excitations.
- Non-resonant Inelastic X-ray Scattering (NIXS):
This moderate-resolution IXS method has two major applications:
(1) Study of core-level excitations. This variants is also known as X-ray Raman Scattering, and can be used to investigate shallow absorption edges of materials through dipole and higher order core-level excitations.
(2) Study of valence electron excitations. This non-resonant IXS method has access to collective electronic excitations like plasmons and d-d excitations.