这是成键和反键。
反键能量比非成键更高。
然而这个，只是为了其完全性，把反键轨道也表示出来。
And this one, just for completeness, is what the antibonding orbital would look like.
这是一个反键轨道。
任何时候你看到有个星，这意味着它是反键轨道。
So any time you see a star that means an anti-bonding orbital.
但当我们讨论反键轨道的时候，它的能量应该更高。
But when we think about where anti-bonding orbitals should be, it should be higher in energy.
我将给分子轨道加上标，这个上标，表示反键轨道，有一个星号。
And I am going to superscript it molecular orbital, and this upper one, to indicate that it's antibonding, has the asterisk.
这是sigma星，来自于1s的反键轨道，它是一个分子轨道。
This is sigma star with the antibonding orbital that came from 1s, and it is a molecular orbital.
这里的这个，因为处在一个较高的能级，被叫做反键分子轨道能级。
And this one here, because it is at a higher energy is called antibonding molecular orbital.
这是反键分子轨道，我们有了成键，现在我们讨论反键。
So if we name this orbital, this is an anti-bonding molecular orbital So we had bonding and now we're talking about anti-bonding.
因为这样，反键轨道被堆积了，这两个电子都填到各自的反键轨道。
And because of the way those antibonding orbitals are stacked, the two electrons go one each into those antibonding.
我们应该把反键轨道标在，高于1s原子轨道能量的地方。
So we would label our anti-bonding orbital higher in energy than our 1 s atomic orbitals.
这证明了，反键轨道，比原子轨道高，成键轨道比原子轨道第。
It turns out that the antibonding orbital is a little bit higher from the atomic orbital level than the bonding orbital is lower.
今天我们先来，讨论两种分子轨道，我们要讨论成键和反键轨道。
So, we'll start today talking about the two kinds of molecular orbitals, we can talk about bonding or anti-bonding orbitals.
因此你能看到,反键轨道上有两组，三组成键，得到一组净成键，所以成的是单键。
so you can see that there is going to be two sets in antibonding, three sets in bonding for a net of one, giving us the single bond.
通过CO分子接近表面时各分子轨道能量本征值的变化，讨论了各轨道的成键、反键特征。
The bonding and antibonding character for the CO valence level have also been studied by analysis of the variations of the molecular eigenvalues when the CO molecule approaches the surface.
另外一个要指出的事情是，反键轨道引起的能量升高，和成键轨道引起的能量降低是相同的。
And the other thing to point out is that the energy that an anti-bonding orbital is raised by, is the same amount as a bonding orbital is lowered by.
特别的，我们把它们和，分子轨道相联系起来，我们说它们可以成为，成键轨道或者反键轨道。
So specifically, what we do associate them instead is within molecular orbitals, and what we say is that they can be either in bonding or anti-bonding orbitals.
同样的，这是反键轨道，你们看到当你有反键轨道的时候，两个原子核中间的电子密度更小了。
So again, this is an anti-bonding orbital, and what you see is that there is now less electron density between the two nuclei than there was when you had non-bonding.
我们可以用叫做，键序的概念来弄明白它，键序等于1/2乘以成键电子，数目减去反键电子数目。
The way that we can figure this out is using something called bond order , and bond order is equal to 1/2 times the number of bonding electrons, minus the number of anti-bonding electrons.
计算量子点分子中束缚能级之间跃迁的振子强度表明，只有成键态和相应的反键态之间跃迁才是允许的。
And the bound state with the highest energy level in the quantum-dot molecule changes gradually into a quasibound state when the electric field strength increases.
s和1s上两个电子组成的键合电子成椭圆形,这是成键，这是反键电子，这些是刚刚已经画过的能级,我也给你们画了。
s plus 1s gives you this oval ellipsoid which is the bonding, and here are the antibonding, and then these are the energy levels that I have been drawing for you.
本文对分子轨道理论教学中关于对称性匹配原则，最大重叠原则， 分子轨道符号及反键效应等几个问题进行了讨论。
The present author discusses the symmetricalmatching principle, the maximum overlapping principle, the molecule orbitalsymbols and the anti-bond effect in the teaching of the molecule orbital theory.
所以你可以看到这是不成键的，它甚至比不成键还糟糕，它是反键，因为我们实际上是去掉了，两个原子核之间的电子。
So you can see that this is non-bonding, this is even worse than non-bonding, it's anti-bonding, because we're actually getting rid of electron density between the two nuclei.
所以你可以看到这是不成键的，它甚至比不成键还糟糕，它是反键，因为我们实际上是去掉了，两个原子核之间的电子。
So you can see that this is non-bonding, this is even worse than non-bonding, it's anti-bonding, because we're actually getting rid of electron density between the two nuclei.
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