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1.
We have detected large deviations of the MJ = 0, J = 2 ← 1 Stark effect transition in the linear molecule HCN?HF from predictions of second-, and even fourth-, order perturbation theory. In order to account satisfactorily for the observed effect it has been necessary to set up and diagonalize the appropriate energy matrix. Smaller deviations in the case of MJ = 1, J = 2 ← 1 have likewise been treated. The values of the electric dipole moment for HCN?HF calculated from these transitions, which show large and small deviations from second-order theory, and from one (MJ = 3, J = 4 ← 3) which shows effectively zero deviation, are now consistent and are as follows:
μ/D | |||
2 ← 1 | 0 | 5.627 | |
1 | 5.601 | ||
4 ← 3 | 3 | 5.608 | |
Mean | 5.612 |