Unformatted text preview: tick mark on the negative z1 -axis in ﬁgure 5.1. Similarly electron 2 is around the right
proton, so its z2 positions are clustered around the positive value zrp indicated by the tick
mark on the positive z2 axis. This means the wave function, Ψ(0, 0, z1 , 0, 0, z2 ), will look as
shown in the left picture of ﬁgure 5.1. It will be mostly in the quadrant of negative z1 and
positive z2 .
Similarly ψr ψl will look as the second picture. Here the positions of electron 1 cluster around
the positive position of the right proton and those of electron 2 around the negative position
of the left proton.
When you average the two states symmetrically, you get a two-blob picture like the third
picture. Now it is electron 1 around the left proton and electron 2 around the right one or...
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