Stark Effect from 1.1 to 2.6 Millimeters Wavelength : PH3, PD3, DI, and CO

Abstract

The Stark effect has been observed in the microwave rotational spectra of PH₃ and PD₃ at 1.1 and 2.1 mm wavelength, respectively, in DI¹²⁷ at 1.5 mm, and in C¹²O¹⁶ at 2.6 mm. The J = 1→2 transition of PD₃ has been observed at 1.08 mm. Analysis of the data yields values of the electric dipole moment, μ, as follows: PH₃, 0.578±0.010 debye; DI, 0.316±0.010 debye; and CO, 0.112±0.005 debye. The centrifugal stretching constants, D_J and D_JK, for PD₃ are found to be 0.80₀ Mc and 1.3₁ Mc, respectively.