Laser-based angle-resolved photoemission spectroscopy

Okay, imagine a flashlight that shines a really bright beam of light. Now imagine this flashlight is special and can shoot out light beams that are made up of tiny things called photons.

Now, scientists use a really powerful flashlight like this to study something called angle-resolved photoemission spectroscopy. That's a fancy way of saying they study how big groups of tiny things called electrons move around inside of stuff.

To do this, they use a special type of laser that sends out bursts of photons. When these photons hit the material they are studying, it can cause some of the electrons inside to get really excited and jump out of the material.

Scientists then measure these electrons that have jumped out by pointing a special instrument at them that can measure how fast they are moving and at what angle they are moving. And this is what is called angle-resolved photoemission spectroscopy.

It's like using a really powerful flashlight to look at how tiny things inside of stuff are moving around.