Find the NO pure-rotational line for J = 1 → 2 in cm⁻¹, to 2 decimals. Moment of inertia is $1.6427\times10^{-46}$ kg m²; h = $6.626\times10^{-34}$ J s; c = $3\times10^8$ m/s.
For the intended rigid-rotor model, $\tilde B=h/(8\pi^2Ic)$, using c in cm/s for cm⁻¹. Substitution gives B ≈ 1.7029 cm⁻¹. The J→J+1 spacing is 2B(J+1), so for J = 1 it is 4B ≈ 6.81 cm⁻¹. Fine-structure refinements of real NO are outside this supplied rigid-rotor model.
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