Low-energy electron microscopy, or LEEM, is like taking a picture of tiny things with a special camera that can see really small things that our eyes can't see.
Imagine you are playing with your toy blocks, but instead of big blocks, you have really tiny ones that are too small to see with your eyes. To see the tiny blocks, you can shine a special light on them that bounces off and goes into your eyes, making you see the blocks. This is kind of like what happens with LEEM.
In LEEM, instead of blocks, you have really tiny things called atoms that are too small to see with your eyes. To see the atoms, you can shine a special kind of light on them, called electrons.
When the electrons hit the surface with the atoms on it, they bounce back and go into the camera. The camera can then create a picture of the surface, showing where the atoms are and what they look like.
LEEM is really useful because it can show us how atoms are arranged on a surface and how they move around. Scientists can use this information to understand how surfaces work and how they might be used in different technologies, like making computer chips or solar panels.