手法を比較

	ATR-FTIR	X線小角散乱法（SAXS）	XANES
分野	分光学	分光学	分光学
系統	Process / pipeline	Process / pipeline	Process / pipeline
提唱年	1961	1954	1975
提唱者	Joop Fahrenfort	Otto Kratky	Peter Lee
種類	Vibrational spectroscopy technique	Synchrotron/X-ray technique	Synchrotron technique
原典	Harrick, N. J. (1960). Study of physics of internal reflection from metals. Journal of Physics and Chemistry of Solids, 13(2), 143-155.	Glatter, O., & Kratky, O. (1982). Small Angle X-ray Scattering. Academic Press.	Lee, P. A., & Pendry, J. B. (1975). Theory of extended x-ray absorption fine structure. Physical Review B, 11(8), 2795-2811.
別名	ATR-IR, attenuated total reflectance, FTIR spectroscopy	SAXS, small-angle scattering	XANES spectroscopy, near-edge X-ray absorption
関連	3	3	3
概要	Attenuated Total Reflectance (ATR) Fourier Transform Infrared (FTIR) spectroscopy is a variant of conventional FTIR that measures infrared absorption through evanescent-wave interrogation of samples in direct contact with a high-refractive-index crystal. Developed by Harrick and Fahrenfort in the 1960s, ATR-FTIR is now the dominant form of FTIR spectroscopy, enabling rapid, non-destructive characterization of organic compounds, polymers, coatings, and biological materials without extensive sample preparation.	Small-Angle X-ray Scattering (SAXS) is a solution-phase X-ray scattering technique that measures the overall shape and size of macromolecules and nanoparticles by analyzing scattering intensity at low angles (0.1-10 degrees). Developed by Kratky and colleagues in the 1950s, SAXS provides information about molecular radius, aggregation state, and overall shape without requiring crystallization or fixing, making it ideal for studying native protein conformations and dynamics.	X-ray Absorption Near Edge Structure (XANES) is a synchrotron X-ray spectroscopy technique that measures the electronic and geometric structure around a specific atom by analyzing the X-ray absorption spectrum within about 50 eV of an absorption edge. Developed by Lee and Pendry in 1975, XANES is complementary to EXAFS and reveals valence state, local symmetry, and unoccupied orbital structure through near-threshold features and resonances.