Abstract
Modulated microwave double resonance has been used to obtain values of collisionally induced transition rates between rotational levels of HCN. Double resonance intensities and phase shifts were measured for a number of pairs of l doublets in HCN. A computer program was written to calculate the intensities and phase shifts in terms of a set of rate constants. The rate constants were varied so as to produce the best least-squares fit to our data. As a check, the rate constants obtained from the least-squares fitting were used to calculate the results of some steady-state double resonance experiments. The calculations and experimental data are found to be in excellent agreement.
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