So sánh phương pháp

	EXAFS	ATR-FTIR	SAXS	XANES
Lĩnh vực	Quang phổ học	Quang phổ học	Quang phổ học	Quang phổ học
Họ	Process / pipeline	Process / pipeline	Process / pipeline	Process / pipeline
Năm ra đời	1971	1961	1954	1975
Người khởi xướng	Edward Stern	Joop Fahrenfort	Otto Kratky	Peter Lee
Loại	Synchrotron technique	Vibrational spectroscopy technique	Synchrotron/X-ray technique	Synchrotron technique
Công trình gốc	Sayers, D. E., Stern, E. A., & Lytle, F. W. (1971). New technique for investigating noncrystalline structures: Fourier analysis of the extended X-ray absorption fine structure. Physical Review Letters, 27(18), 1204-1207.	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.
Tên gọi khác	EXAFS spectroscopy, X-ray absorption spectroscopy	ATR-IR, attenuated total reflectance, FTIR spectroscopy	SAXS, small-angle scattering	XANES spectroscopy, near-edge X-ray absorption
Liên quan	3	3	3	3
Tóm tắt	Extended X-ray Absorption Fine Structure (EXAFS) is a synchrotron-based X-ray spectroscopy technique that measures the local geometric and electronic structure around a specific atom in any material, crystal or amorphous. Discovered by Sayers, Stern, and Lytle in 1971, EXAFS reveals interatomic distances, coordination numbers, and disorder in the atomic environment by analyzing oscillations in the X-ray absorption spectrum above an absorption edge.	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.