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    • 8. 发明授权
    • Device for the detecting of charged secondary particles
    • 用于检测带电二次粒子的装置
    • US4983833A
    • 1991-01-08
    • US393221
    • 1989-08-14
    • Matthias BrunnerRalf SchmidMichael Regula
    • Matthias BrunnerRalf SchmidMichael Regula
    • H01J37/147G01Q30/02G01Q90/00H01J37/244H01J37/26
    • H01J37/268H01J37/244H01J2237/2448H01J2237/2449H01J2237/24507
    • A device for the detection of secondary electrons triggered at a large-area specimen is composed of a tube electrode arranged concentrically relative to the primary beam axis of an electron beam measuring device and an electrostatic or magnetic octupole for the deflection of the secondary electrons in the direction of a detector. An opposing electrical field is formed by two hemispherically shaped electrodes. The tube electrode which is arranged immediately above the specimen, and preferably has a circular cross-sectional area, whereby the tube diameter is selected larger than the diagonal of the specimen. An electrical extraction field that is rotationally symmetric with respect to the primary beam axis is generated inside the device. The secondary particles will be accelerated in the direction of the deflection unit.In the electrical extraction field, the particles are detected independently of the location of the respective measuring point inside the scanned field that is 20.times.20 cm.sup.2 in size.
    • 用于检测在大面积标本处触发的二次电子的装置由相对于电子束测量装置的主光束轴同心布置的管电极和用于二次电子的偏转的静电或磁八极 检测器的方向。 相反的电场由两个半球形电极形成。 管状电极配置在试样的正上方,优选具有圆形的横截面积,从而选择管径大于试样的对角线。 在器件内产生相对于主光束轴旋转对称的电提取场。 次级粒子将沿着偏转单元的方向被加速。 在电提取领域中,独立于扫描场内相应测量点的尺寸为20×20cm 2的位置来检测颗粒。