HF molecule. Intensity is proportional to ∫ |Ψ(r)|2dz.
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HF molecule structure

Isolated F atom has 7 electrons in 4 orbitals
2s ↑↓     2px ↑↓     2py ↑↓     2pz ↑
The last electron makes bond with H atom. Hydrogen orbitals 2px, 2py are also used to hold non-bonding (lone pair painted in blue) electrons.
Valence bond theory     updated 9 Apr 2012