Isotopic Spectra of the Hydroxyl Radical

Rotational
spectra of OH and its isotopologues have been precisely measured using
high efficiency terahertz (THz) sources. The measurements are compared
with existing data and are useful for global modeling. For the first
time, microwave measurements of the Λ-doubling transitions of
the 17OH isotopologue are combined with THz data successfully.
Precise rotational, fine-structure, and hyperfine structure parameters
for the 17OH isotopologue are reported. An isotopically
independent Dunham model for all isotopologues of 2Π
OH v < 3 is presented.