And this is called photoelectron spectroscopy, and essentially what it is is very similar conceptually to what we were talking about way back in the first couple lectures when we were talking about the photoelectric effect.

也就是光电子能谱，从本质上来讲,这项技术,与我们在最开始的几节课上讲的,光电效应在概念上非常相似。

麻省理工公开课 - 化学原理课程节选