The SO 2 molecule, analogous to H 2 O, has a 1 A 1 ground electronic state with the valence electronic configuration (1a 2 ) 2 (4b 2 ) 2 (6a 1 ) 2 (2b 1 ) 0 and low lying excited singlet states of symmetry 1 B 1 , 1 A 2 , and 1 B 2 Account for the configurations of these excited states Which of these states are E1 allowed Experiment reveals that weak absorption in the range 280 to 340 nm is due to the transition 1 A 1 1 A 2 How does this transition become allowed

Question: The SO 2 molecule, analogous to H 2 O, has a 1 A 1 ground electronic state with the valence electronic configuration (1a 2 )

The SO₂ molecule, analogous to H₂O, has a ¹A₁ ground electronic state with the valence electronic configuration …(1a₂)²(4b₂)²(6a_₁)²(2b₁)⁰ and low-lying excited singlet states of symmetry ¹B₁, ¹A₂, and ¹B₂. Account for the configurations of these excited states. Which of these states are E1-allowed? Experiment reveals that weak absorption in the range 280 to 340 nm is due to the transition ¹A₁ → ¹A₂. How does this transition become allowed?

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