Compara mètodes

	Dispersió de raigs X a petit angle (SAXS)	Espectroscòpia infraroja per reflectància total atenuada (ATR-FTIR)	XANES
Camp	Espectroscòpia	Espectroscòpia	Espectroscòpia
Família	Process / pipeline	Process / pipeline	Process / pipeline
Any d'origen	1954	1961	1975
Autor original	Otto Kratky	Joop Fahrenfort	Peter Lee
Tipus	Synchrotron/X-ray technique	Vibrational spectroscopy technique	Synchrotron technique
Font seminal	Glatter, O., & Kratky, O. (1982). Small Angle X-ray Scattering. Academic Press.	Harrick, N. J. (1960). Study of physics of internal reflection from metals. Journal of Physics and Chemistry of Solids, 13(2), 143-155.	Lee, P. A., & Pendry, J. B. (1975). Theory of extended x-ray absorption fine structure. Physical Review B, 11(8), 2795-2811.
Àlies	SAXS, small-angle scattering	ATR-IR, attenuated total reflectance, FTIR spectroscopy	XANES spectroscopy, near-edge X-ray absorption
Relacionats	3	3	3
Resum	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.	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.	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.