試題詳解

2. An O_h XY₆ molecule exhibits two Tru, IR active modes. Which statement is true?
(A) Each Tiu mode is triply degenerate, and each gives rise to one absorption in the IR spectrum of XY₆  
(B) Each Tiu mode is triply degenerate, and each gives rise to three absorptions in the IR spectrum of XY₆
(C) Each Tlu mode is non-degenerate, and gives rise to one absorption in the IR spectrum of XY₆
(D) One of the Tiu modes is the symmetric stretching mode of XY₆