卡尔蔡司 EM 902 透射电子显微镜。用途：主要用于薄样品的微分析，可确定生物相关原子元素（如 P、S、N、O、Ca、Mg 等）的空间分布和浓度，适用于生物学、材料科学等领域，尤其适合轻元素样品成像分析16。技术原理：采用棱镜 - 反射镜 - 棱镜型成像光谱仪，基于 Castaing - Henry 光谱仪原理，根据电子能量分离电子，通过狭缝光阑选择光谱不同区域，过滤后的电子由显微镜投影镜成像4。性能：加速电压 80kV 时，可选能量损失范围 0 - 2000eV，放大倍数 150× - 400,000×，衍射相机长度 390mm - 2900mm，零能量损失时空间分辨率晶格为 0.344nm，点对点为 0.5nm，90mm 图像能量分辨率 ±7.5eV（15eV 狭缝尺寸）1。Product Name: Carl Zeiss EM 902 Transmission Electron Microscope.Purpose: It is mainly used for micro - analysis of thin specimens, which can determine the spatial distribution and concentration of biologically - relevant atomic elements (such as P, S, N, O, Ca, Mg, etc.). It is suitable for fields like biology and materials science, and is especially suitable for imaging and analysis of light - element samples.Technical Principle: It adopts a prism - mirror - prism type imaging spectrometer. Based on the principle of the Castaing - Henry spectrometer, it separates electrons according to their energy. Different regions of the spectrum are selected through a slit aperture, and the filtered electrons are imaged by the projector lens of the microscope.Performance: When the acceleration voltage is 80kV, the selectable energy loss range is 0 - 2000eV, the magnification range is 150× - 400,000×, the diffraction camera length is 390mm - 2900mm. The spatial resolution at zero - energy loss is 0.344nm for lattice and 0.5nm for point - to - point. The energy resolution of a 90mm image is ±7.5eV (15eV slit size).