Problem 3
Which of the following molecules may show a pure rotational spectrum in the microwave region: \(\mathrm{H}_{2}, \mathrm{HCl}, \mathrm{CH}_{4}, \mathrm{CH}_{3} \mathrm{Cl}, \mathrm{H}_{2} \mathrm{O}, \mathrm{NH}_{3}\).
Problem 4
An experimental peak \(f(\omega)\) has height \(H\) and full width at half maximum \(W\). Assume that a Gaussian shape would fit the peak and find that its integral \(\int F(\omega) \mathrm{d} \omega=1.064 H W \approx H W\).
