A simplified absorption spectrum of a diatomic molecule shows three distinct, narrow peaks at the following wavenumbers:
• 1.20 cm⁻¹
• 2.15 × 10³ cm⁻¹
• 4.7 × 10⁴ cm⁻¹
Which peak corresponds to a rotational transition?
a) 2.15×103cm−1
b) 4.7×104cm−1
c) 1.20cm−1
d) 1.20cm−1and2.15×103cm−1