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← ScienceWhich consequence results when specific molecular orbitals become unoccupied?
A)Increased molecular vibrational mode lifetime
B)Increased electron paramagnetic resonance intensity
C)Reduced quantum yield in fluorescence✓
D)Increased intermolecular van der Waals forces
💡 Explanation
Unoccupied anti-bonding orbitals trigger non-radiative relaxation because internal conversion occurs as the excited electron falls to the ground state therefore decreasing fluorescence, rather than radiative emission favored by other conditions.
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