CAT（キャット）法

CAT (composition analysis by thickness-fringe) method

[目次：理論(電子の散乱／回折／結像)]

Al_xGa_1-xAsの人工格子のように格子間隔は等しいが組成が異なる層の組成を決めるために考えられた方法。等厚干渉縞の間隔が結晶構造因子に逆比例することを利用して、異なる組成の層からなる楔形試料から得られる等厚干渉縞の間隔の差から組成を決定する。

The "CAT" method is devised to determine the compositions of layer materials that have the same lattice spacing but have different compositions between the layers, like an artificial lattice material of Al_xGa_1-xAs. Utilizing the fact that the distance between thickness fringes (extinction distance) is inversely proportional to the crystal structure factor, this method determines the compositions of the different layers by measuring the difference of the extinction distances between the layers of a wedge-shaped specimen.

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