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Which consequence results when sigma (σ) bond order changes?

A)Modified molecular rotational energy levels
B)Vibronic coupling reduces stability greatly
C)Faster intersystem crossing occurs more readily
D)Photoelectric ejection increases with intensity

💡 Explanation

Changes in sigma bond order directly modify occupancy of bonding molecular orbitals because increased bond order affects the potential energy surface; therefore rotational energy levels change rather than altering only vibronic coupling with vibrational modes that are less directly affected.

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