MICROWAVE DOUBLE RESONANCE EXPERIMENTS ON HCN

This research was supported in part by the National Science Foundation. $^{1}$ A.P. Cox, G.W. Flynn and E.B. Wilson, Jr., J. Chem. Phys. 42, 3094 (1965). $^{2}$ R.G. Gordon, J. Chem. Phys. 46, 4399 (1967). $^{3}$ T. Oka, J. Chem. Phys. 47, 13 (1967).Author Institution: Chemistry Department, Harvard University; NASA Electronic Research Center, Harvard UniversityModulated microwave double $resonance^{1}$ has been employed to obtain rate constants for collisional transfer of rotational energy between specific states of HCN. Using the expression obtained by $Gordon,^{2}$ a computer program has been written to calculate relative intensities and phase shifts for an assumed set of transition rates. Our data have been fit by varying the rate constants in a least squares analysis. The rate constants so obtained satisfactorily reproduce the results of Oka's $experiments^{3}$ on HCN