Entrance slit and the grating are fixed and the exit slit scans across the Rowlandcircle.
入射狭缝及光栅固定起来，出射狭缝扫描过罗兰圆。
2
All components of the monochromator were laid on the Rowlandcircle. The position of the exit slit was changed to obtain the corresponding monochromatic light in the exit slit of the monochromator.