If the component of the orbital angular momentum along the molecular axis of a heteronuclear diatomic molecule is non-zero, the rotational-vibrational spectrum will show
(a)P and R branches only.
(b)P and Q branches only.
(c)Q and R branches only.
(d)All the P, Q and R branches
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
With Λ ≠ 0 (e.g. NO, ²Π) the ΔJ = 0 Q branch becomes allowed in addition to P and R.