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A parallel plate Stark cell has been designed and constructed for the millimeter wave region of the spectrum. With the cell both π and σ Stark components can be observed. High precision Stark effect measurements have been made on the π and σ components of the J=0→1 transition of HCN¹⁴. From these the electric dipole moment of HCN in the ground vibrational state has been calculated to be 2.985±{}0.005 Debye units.
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Bhattacharya et al. (1960) studied this question.
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