เปรียบเทียบวิธี

	[UNTRANSLATED_TO_THAI]	Extended X-ray Absorption Fine Structure (EXAFS)
สาขาวิชา	สเปกโทรสโกปี	สเปกโทรสโกปี
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1960	1971
ผู้ริเริ่ม	Clemens Roothaan	Edward Stern
ประเภท	Computational method	Synchrotron technique
แหล่งต้นตำรับ	Roothaan, C. C. J. (1960). New developments in molecular orbital theory. Reviews of Modern Physics, 32(2), 179-185.	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.
ชื่อเรียกอื่น	CI, configuration interaction method, CI calculations	EXAFS spectroscopy, X-ray absorption spectroscopy
ที่เกี่ยวข้อง	3	3
สรุป	Configuration Interaction (CI) is a post-Hartree-Fock quantum chemistry method that improves upon mean-field molecular orbital theory by treating electron correlation through a linear combination of electronic configurations. Introduced by Roothaan in 1960, CI corrects for the fundamental limitation of single-determinant theory by allowing the wavefunction to be a superposition of excited-state Slater determinants, systematically accounting for electron-electron interactions.	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.