複選題

26. Which of the following statements correctly describe the rotational spectral activity of the listed molecules in microwave and rotational Raman spectroscopy, based on selection rules?
(A) CH₄ shows rotational P/R branches in microwave spectroscopy because of its symmetric tetrahedral structure.
(B) O₂ is both microwave and rotational Raman active because its symmetric stretch changes.
(C) HBr is active in microwave spectroscopy because it is a heteronuclear diatomic molecule.
(D) N₂ is microwave inactive but rotational Raman active.
(E) CO₂ can show rotational Raman spectra but is microwave inactive due to its linear and centrosymmetric structure.