HF molecule. Intensity is proportional to
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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 theoryupdated 9 Apr 2012