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二、实验方法 1.仪器能量定标刚离开样品的光电子的动能范围比较大(如在MgKa激发下,0～1250 eV),进入能量分析器的光电子的动能范围,由于透镜减速,已大大缩小(如0～65 eV)。由此,光电子由于动能变化引起的质量变化很小,以至于可把经过分析器的光电子的质量看作常数,从而使光电子能量与分析器电压有比较好的线性关系。分析器电压由基准电源控制的扫描高压发生器供给,基准电源又受到定标电路的调节。调节定标电位器,使分析器电压和能量读数之间的比例系数为1,这就是每台电子能谱仪在投入使用之前,必须做的能量定标工作。
Second, the experimental method 1 instrument calibration energy just leaving the sample of photoelectrons kinetic energy range is relatively large (such as MgKa excitation, 0 ~ 1250 eV), into the energy analyzer photoelectron kinetic energy range, due to lens deceleration, has been greatly reduced (Eg 0 ~ 65 eV). As a result, the change in mass due to the change in kinetic energy of the photoelectron is so small that the mass of the photoelectron passing through the analyzer can be regarded as a constant, so that there is a good linear relationship between the photoelectron energy and the analyzer voltage. The analyzer voltage is supplied by a scan high-voltage generator controlled by a reference power supply, which is in turn regulated by a scaling circuit. Adjust the scaling potentiometer so that the scale factor between the analyzer voltage and the energy reading is 1, which is the energy calibration that each electronic spectrometer must do before it is put into use.