s-px bond. Intensity is proportional to ∫ |Ψ(r)|2dz.
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Bonding 1s - 2px orbital is made (rather arbitrarily) as
    Ψ2px(r) + e -|r - d |/2
where d = (8, 0, 0). All the rest molecules are made in a similar way.

Valence bond theory     updated 10 Apr 2012