日立 HITACHI S-3500H用途：适用于材料科学、生命科学、半导体等领域。可用于观察材料微观结构，如金属、陶瓷等材料的内部组织；研究生物样品超微形态，像细胞、微生物的精细结构；分析半导体芯片细微构造；还能对材料表面微区成分进行定性和半定量分析，能直接观察不导电样品。技术原理：电子枪发射电子束，经加速电压加速后，通过磁透镜聚焦到样品表面，在偏转线圈作用下进行光栅扫描。电子与样品相互作用产生二次电子、背散射电子等信号，探测器收集并转化为电信号，经放大处理成像。其可变压力（VP）模式，通过向样品室充入特定压力气体，利用气体分子产生的正离子消除荷电，实现不导电样品直接观测。性能：分辨率方面，高真空模式下，30kV、5mm 工作距离时为 3.0nm，3kV、5mm 工作距离时为 7.0nm；可变压力模式下，30kV、5mm 工作距离时为 4.0nm，5kV、5mm 工作距离时为 10.0nm；放大倍率为 5 - 300,000 倍（照片显示），7 - 800,000 倍（显示器显示）；加速电压 0.3 - 30kV；可变压力范围 6 - 650Pa；配备 5 轴马达驱动样品台，具备优中心倾斜、旋转等功能；拥有大尺寸样品室，可容纳直径达 200mm、高度 80mm 的样品；标准配备涡轮分子泵，创造清洁干燥真空条件。Product Name: Hitachi HITACHI S-3500HPurpose: It is applicable to fields like materials science, life sciences, and semiconductors. It can be used to observe the microstructure of materials, such as the internal structure of metals and ceramics; study the ultrastructure of biological samples, like the fine structure of cells and microorganisms; analyze the fine structure of semiconductor chips; and conduct qualitative and semi - quantitative analysis of the micro - area composition on the material surface. It is capable of directly observing non - conductive samples.Technical Principle: The electron gun emits an electron beam. After being accelerated by the acceleration voltage, the electron beam is focused on the sample surface through a magnetic lens and undergoes raster scanning under the action of a deflection coil. The electrons interact with the sample to generate signals such as secondary electrons and backscattered electrons. The detector collects these signals and converts them into electrical signals, which are then amplified and processed for imaging. Its variable pressure (VP) mode fills the sample chamber with gas at a specific pressure. The positive ions generated by gas molecules are used to eliminate charging, enabling the direct observation of non - conductive samples.Performance: In terms of resolution, in high - vacuum mode, it is 3.0nm at 30kV and 5mm working distance, and 7.0nm at 3kV and 5mm working distance. In variable - pressure mode, it is 4.0nm at 30kV and 5mm working distance, and 10.0nm at 5kV and 5mm working distance. The magnification is 5 - 300,000 times (photo display) and 7 - 800,000 times (monitor display). The acceleration voltage ranges from 0.3 - 30kV. The variable - pressure range is 6 - 650Pa. It is equipped with a 5 - axis motor - driven sample stage with functions such as eucentric tilt and rotation. It has a large - sized sample chamber that can accommodate samples with a diameter of up to 200mm and a height of 80mm. It comes standard with a turbo - molecular pump to create a clean and dry vacuum condition.