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Hybrid sp 3 orbital. Intensity is proportional to ∫ |Ψ(r)|2dz.
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Hydrogen wave functions
    Ψ2s ~ (2 - r) e -r/2,     Ψ2px ~ x e -r/2,
are used to get hybrid sp 3 orbitals
    sp 31 = (Ψ2s + Ψ2px + Ψ2py + Ψ2pz ) / 2 ,
    sp 32 = (Ψ2s - Ψ2px - Ψ2py + Ψ2pz ) / 2 ,
    sp 33 = (Ψ2s - Ψ2px + Ψ2py - Ψ2pz ) / 2 ,
    sp 34 = (Ψ2s + Ψ2px - Ψ2py - Ψ2pz ) / 2 .

Valence bond theory     updated 9 Apr 2012