Thus, photostimulated single electron transfer in CTC followed by expelling chloride ion leads to a biradical, which couples intramolecularly.

所以，光诱导的单电子转移和随后的氯离子离去导致双游离基，双游离基分子内偶合成环。

youdao

And what I want to point out that we just figured out for molecular orbital theory, is that o 2 is a biradical, because remember, the definition of a radical is when we have an unpaired electron.

我要指出的是,我们刚利用分子轨道理论，指导了O2是二价自由基，因为记住，自由基的定义是,有个未配对的电子。

麻省理工公开课 - 化学原理课程节选