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So if we're subtracting the interference term, what we have here now is destructive interference.
如果我们减去干涉项，我们得到的就是相消干涉。
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So if we write out every term individually, what we end up with is essentially just the probability density for the first atom, then the probability density for the second atom, and then we have this last term here, and this is what ends up being the interference term.
如果我们把每一项都写出来，最后得到的就是,第一个原子的概率密度，然后是第二个原子的概率密度，然后是这最后一项，这就是干涉项。
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You've heard about RNA interference, for example, and that is the process of stopping this, to stop a gene from being expressed.
比如说,你们听说过的RNA干扰,就是一种阻止,基因表达的手段
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Got it.At one end though, s the Wall Street end, s much harder to see direct government interference.
明白，但是另一方面，华尔街，it’,很难看见，it’,政府的直接干预。
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And again, if we write out what all the terms are, we again have 1 s a squared plus 1 s b squared, but now what we're doing is we're actually subtracting the interference term.
同样，如果我们把所有的项都写出来，同样我们有1s平方加上1sb平方，先现在我们做的是,我们要减去干涉项。
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So we can draw that for 1 s a, we can also draw it for 1 s b, and what I'm saying for the molecular wave function is that we have the interference between the two, and we have a constructive interference, so we end up adding these two wave functions together.
所以我们可以对1sa画出它来，我们也可以对1sb画出它来，对于分子波函数我要说的是,它们两者之间会干涉，这里我们有相长干涉，所以我们得到的是波两个波函数加起来。
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Since we're talking about wave functions, since we're talking about the properties of waves, we don't only have constructive interference, we can also imagine a case where we would have destructive interference.
因为我们讨论的是波函数，因为我们讨论的是波的性质，我们不仅有相长干涉，我们也可以想象在,某种情况下会有相消干涉。
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When we were talking about constructive interference, we had more electron density in between the 2 nuclei.
当我们讨论相长干涉的时候，在两个原子核之间有更多的电子密度。
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So if we have constructive interference between the two, what we're going to see is our molecular orbital looks something like this.
如果两者是相干干涉，我们看到分子轨道,看起来是这个样子的。
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And the pi star orbitals result from any time you have destructive py interference from 2 p orbitals that are either the p x or the p y.
星轨道是由于2p轨道的相消干涉,不管是px还是。
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And all we mean by constructive interference is that literally those two waves add together, such as the maxima are now twice as high, and the minima are now twice as low.
相干相长，相干相长也就是,说两个波加在一起，所以最大值变成2倍那么高，最低值变成2倍那么低。
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So let's think of them a little bit more by graphing the amplitude of the wave, and seeing how we can have this constructive interference.
让我们把波的,振幅画出来考虑一下,我们怎么能得到这种相长干涉。
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So in this case the cross term represents constructive interference between the two 1 s atomic wave functions.
在这种情况下交叉项代表两个,1s原子波函数的相干干涉。
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In contrast, if we have destructive interference, what we're going to form is a sigma 2 s star, and what does the star designate?
相反，如果我们是相消干涉，我们会形成sigma2s星，星代表什么？
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So, another example of destructive interference is just with the Bose headphones.
另一个相干相消的粒子,就是Bose耳机。
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I just wanted to introduce those concepts because you've read about them; we'll be talking more about RNA interference in particular as we go on through the course.
我只是想简单介绍下这些概念,因为你们已经读过它了,随着课程的深入,我们将会讨论更多关于RNA干扰的内容
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sa So we have 1 s a, and we're drawing this as having a positive amplitude, but since we have destructive interference we're going to draw 1 s b as having the opposite sign, so we have a plus and a minus in terms of signs.
我们有，我们把这画成一个正的振幅，但因为我们是相消干涉,我们把1sb画成相反的符号，所以我们有一正一负两个符号。
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