详细谈谈：赛默飞电镜的前世今生
Apero2的设计特点
1. T1探测器的设计
如何避免非导电样品的荷电效应一直是高分辨成像的难题，高分子和生物类样品，还容易受到电子束的损伤。常规喷金手段所使用的黄金和白金靶材，其颗粒都会掩盖纳米颗粒的细节。利用背散射探测器可以抑制荷电效应，但传统的半导体探测器有能量阈值的限制，在小于2kev加速能量时，几乎采集不到信号。而T1探测器不存在能量阈值，且设计在极靴附近的位置，充分利用背散射电子空间发射的特点，在低电压和低束流下也拥有非常好的信噪比，在材料科学与生命科学领域，有着优异的成像表现。
图12 （左图）氧化铝增强氧化锆陶（右图）溶菌酶-纳米银复合材料，黄色圆圈位置，可见尺寸约5nm左右银颗粒
2. 工作距离WD10mm下的高分辨成像
能谱采集和高分辨成像的条件是相互冲突，很多时候，不能在高分辨的模式（比如WD=4mm）下兼顾能谱仪的采集计数率。在实际操作时，往往也会碰到很多高度不统一的样品，过短的WD存在碰撞极靴的风险，大工作距离的高分辨成像就变的有实际意义。如图13所示，即使在WD=10mm情况下，依旧轻松上到10万倍（底片），1KV下依旧能观察到磁性粉末表面的纳米颗粒细节。
3. 免费的大面积拼图软件
大面积拼图软件的好处不必多说，从成像策略角度看，相当于锦上添花。
图13 （左图） 磁性粉末样品，WD=4mm， 100Kx（右图） 磁性粉末样品，WD=10mm， 100Kx
图14 Apero2的探测器位置设计及其成像特点
在产品的更新迭代上，赛默飞电镜一直传承了飞利浦和FEI的高性能与用户体验兼顾的设计理念，发布了多款在业内有口皆碑的设备。如今，Thermo Scientific拥有电子显微镜市场的最大市场份额，在各行各业提供最全面、最优异的各类电子显微镜产品。
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