It's called this just because it's an electron that results when an electron absorbs a photon's worth of energy, so thus it's a photoelectron.

之所以这样称呼是因为,当一个电子吸收,一个光子的能量的结果，因此它是一个光电子。

麻省理工公开课 - 化学原理课程节选

If you see a problem that asks you, for example, the third ionization energy versus taking a second electron out of the 2 s in a photoelectron spectroscopy experiment, those are two very different things.

如果你遇到一个题目问你的是，比如说，是第三电离能,还是在光电子能谱实验中从，2，s，轨道中,拿走第二个电子，这可是两个完全不同的问题。

麻省理工公开课 - 化学原理课程节选