Orbital interactions strength

A similar mchanism explains the predissociation of the A2E+ state of the hydrogen halide cations by a 4n state. For HBr+, where the spin-orbit interaction strength is very large, the width of the v = 4 level is equal to 800 cm-1 (exp Penno, et al, 1998, calc. Banichevich, et al, 1992). For HI, the width is so large that the spectrum becomes continuous (Lefebvre-Brion, 1991). 

There are many occupied and unoccupied molecular orbitals in molecules. Interactions occur between any pair of the molecular orbitals. The strengths of the interactions and the effects on the energies of interacting molecules are different from each other. Some lead to significant stabihzation or destabihzation, others to only slight stabihzation or destabilization. 

Orbital Interaction Affects Bond Strength of iV-Nitroso Bond. 174... 

Figure 6.8. Summary of molecular orbital theory for homonuclear molecules. Note how the stability of a chemical bond depends both on the interaction strength and the filling of the orbitals.

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