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The 449 MHz l -type doubling spectrum of HCN has been measured to high precision with a molecular beam maser spectrometer. Hyperfine structure due to both the nitrogen nucleus and the proton was resolved, and the coupling constant of the proton I • J interaction was found to be - 27.3 ± 1.6 kHz. The spectrometer is also suited to precise measurements of Stark effects in molecules of the linear and symmetric top variety, and Stark shifts of up to 10 4 times the zero-field line width have been measured in the HCN spectrum. Analysis of these measurements yields the value μ = 2.940 ± 0.001 D for the dipole moment of the v  2 = 1 state of HCN.

Stark effect and hyperfine structure of HCN measured with an electric resonance maser spectrometer