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对电子衍射花样进行鉴定,必须精确地知道仪器常数,而仪器常数是透镜电流和试样位置的复合函数,对于在同样试样位置和同样透镜电流下,精确测定仪器常数最常用的技术是在试样上蒸发一个标准样,例如金,以使标准的衍射谱线与被测试样的未知谱线出现在同一底片上,从而通过标准谱线精确地测得仪器常数,从而达到测定未知试样衍射花样的目的.但这种方法有一些缺点,即标准谱线与被测未知试样质点
To identify the electron diffraction pattern, the instrument constant must be accurately known and the instrument constant is a complex function of the lens current and the specimen position. The most commonly used technique for accurately determining the instrument constant at the same specimen position and at the same lens current is at A standard sample, such as gold, is evaporated on the sample so that the standard diffraction line appears on the same film as the unknown spectrum of the sample to be measured, thereby accurately measuring the instrument constant by the standard line to reach an unknown sample Diffraction pattern purposes, but this method has some disadvantages, namely, the standard spectral line and the measured unknown sample particle