So, let's think of the energy of interaction when we're comparing atomic orbitals to molecular bonding orbitals.

当我们比较原子轨道和分子轨道的时候,我们来考虑一下相互作用能。

麻省理工公开课 - 化学原理课程节选

And a sigma bond forms any time you have two orbitals coming together and interacting on that internuclear axis.

当你把两个轨道合在一起,并在核间轴上有相互作用时,就形成了sigma键。

麻省理工公开课 - 化学原理课程节选

What about this second bond here sigma where we're going to have interaction of 2 p orbitals, is that sigma or pi?

那2p轨道相互作用的第二个键呢,它是，还是π？

麻省理工公开课 - 化学原理课程节选

So let's take a look at another case where we have s p 2 hybridization, we can actually also have it happen in carbon.

它是B2sp2杂化轨道,和H1s轨道的相互作用，让我们看看另外一个。

麻省理工公开课 - 化学原理课程节选

So we can kind of flip it this way this will be one pi bond, this will be another interacting between these p orbitals.

我们可以把它这样翻一下,这是一个π键，这是另外一个p轨道之间,相互作用的π键。

麻省理工公开课 - 化学原理课程节选

The reason that it's a sigma bond is sp3 because the s p 3 hybrid orbital is directly interacting with the 1 s orbital of the hydrogen atom, and that's going to happen on the internuclear axis, they're just coming together.

它是sigma键的原因,是因为,杂化轨道直接和氢原子1s轨道相互作用，它们作用发生在核间轴上，它们会到一起。

麻省理工公开课 - 化学原理课程节选