動径分布関数

radial distribution function

[目次：画像処理(画像処理／波形処理)]

等方的なアモルファス物質から得られる回折図形(ハロー図形)の強度曲線から、異なる原子間の干渉項のみを取り出して(具体的にはその強度曲線の起伏の真ん中を通るような滑らかなバックグラウンドを差し引いて)フーリエ変換したもの。隣接原子までの平均距離(距離の分布)や隣接原子の平均の個数、密度が分かる。

A diffraction pattern (halo pattern) is taken from an isotropic amorphous substance. From the intensity distribution curve of the pattern, the smooth background passing through the center of the wavy curve is subtracted to remove only the interference term between different atoms. The "radial distribution function" is obtained by the Fourier transform of the interference term. The average interatomic distance (or the distribution of the interatomic distance), the coordination number and the density of the substance can be examined from the function.