The strengths of the first thirteen rotational lines of HCl have been measured by asymmetric Fourier transform techniques. From these strengths, the dipole moment is determined to be 1.134 ± 0.015 D. This value is substantially greater than the value determined from rf polarization measurements. A number of possible sources of systematic this discrepancy. error in the interferometer are considered in an attempt to resolve this discrepancy.
R. B. Sanderson, "Measurement of Rotational Line Strengths in HCl by Asymmetric Fourier Transform Techniques," Appl. Opt. 6, 1527-1530 (1967)