We notice that the value of E at r naught is negative, as it should be. It's a negative number.
我们主要到在r圈时E的值为负,和它本来的值一致,是一个负数。
And this applies only at, obviously, r equals r naught.
这表明,r=r圈。
And at a distance of 2 r naught, I have a positive repulsive term.
在这2r圈的距离上,这里有一个不可忽略的排斥场。
r- So we could just say r plus plus r minus gives you r naught.
因此我们能够说r+加上,得到r圈。
That's 4 pi epsilon zero 3 r naught and so on and so on.
也就是,4πε0,3R圈,以此类推。
And we can find r naught by looking for the minimum.
我们可以通过寻找最小值得到r圈。
dE/dr=0 We take dE by dr equals zero at r equals r naught.
当r等于r圈时。
And this equilibrium spacing is denoted r sub zero or r naught.
这个平衡间距,用r下标0或者r圈表示。
e The charge on the anion times minus e, so there is the minus e squared, 0R0 and divided by 4 pi epsilon zero r naught, because now I am evaluating this function at r naught, one minus one over n where n is the Born exponent.
阴离子的电荷乘以,因此会有-e的频繁,除以4πε,因为现在我用r圈评估这个函数,1-1/n,n是波恩指数。
So I have a distance here of 2 r naught.
因为有一个2r圈的距离。
I know the energy in this first pair would equal -e^2 That is just going to equal minus e squared over 4 pi epsilon zero r naught.
我们明白第一对的能量将会等于,等于,/4πε0,R圈。
You don't need Born repulsion at 2 r naught.
我们不需要在r等于2r圈处的Born力。
So we can start. This distance here is r naught.
所以我们开始。这里的长度是r圈。
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