有一个sigma轨道。
Also, it is cylindrically symmetric around the bonding axis, so this is how we know that it's a sigma orbital.
此外，它关于键轴是圆柱对称的，这就是为什么我们知道它是sigma轨道。
Sigma symmetry of this molecular orbital, specifically that it's cylindrically symmetric about the bond axis.
告诉我们关于，And，the，sigma，tells，us，something，about，the,分子轨道对称性的信息，特别是它关于键轴是圆柱对称的。
And again, I want you to have practiced drawing these out in the form you always need to start with the sigma and then write the number of the orbital.
同样的，我希望你们，练习画这种图，你总是要从sigma开始，然后写出轨道数目。
First of all, this is the two s orbitals in hydrogen, 1s plus 1s smearing to give us this sigma molecular orbital.
首先，这是氢气中的两个s轨道，1s与1s轨道重叠，产生sigma分子轨道。
This is sigma star with the antibonding orbital that came from 1s, and it is a molecular orbital.
这是sigma星，来自于1s的反键轨道，它是一个分子轨道。
So this is the 1 s star, sigma 1 s star orbital, and what you have in the center here is a node, right in the center between the two nuclei.
这是1s星，sigma1s星轨道，中间这个是节点，它在两个原子核中间。
Sigma that is one PI orbital. There is one sigma, one PI and there is a second PI, and that is how we are getting the triple bond.
那是一个pi轨道，有一个，一个pi，还有第二个pi轨道，这就是我们如何得到三线态的。
And we call that, for this case, our sigma 2 s orbital.
对于这种情况，我们可以叫它sigma2s轨道。
And we call that, for this case, our sigma 2 s orbital.
对于这种情况，我们可以叫它sigma2s轨道。
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