x-ray absorption near-edge structure [`eks´rā ǝb`sȯrp·shǝn ¦nir ´ej `strǝk·chǝr] PHYSICS A ripplelike structure in the x-ray absorption spectrum of a substance, at energies just above the absorption edge associated with liberation of core electrons into the continuum, and much closer to the absorption edge than the energies associated with extended x-ray absorption fine structure. Abbreviated XANES. |