They observed the deflections of the particles by allowing them to fall on a fluorescent screen.

他们让粒子落在荧光屏上以观察他们的偏移。

It consists of a magnetic scanning system, a thick slit, a fluorescent screen and a CCD image processing system.

它包括有磁扫描系统，厚窄缝，荧光屏以及CCD图像处理系统。