Which outcome occurs in a molecule when an electron transitions between antibonding and bonding orbitals following photoexcitation?

💡 Explanation

When photoexcitation promotes an electron from an antibonding to a bonding orbital, bond order increases because bonding orbitals contribute positively to bond order while antibonding orbitals contribute negatively, leading to increased stability. Therefore, increased bond order and stability results, rather than changes dependent on vibrational modes, spin flips, or intersystem crossing efficiency.

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