The pure rotational spectrum of the actinide-containing compound thorium monoxide

The J = 1-0 pure rotational transition, together with hyperfine structure where appropriate, has been recorded for all three naturally occurring isotopomers of the actinide-containing compound thoriurn monoxide ((ThO)-Th-232-O-16,(ThO)-Th-232-O-17 and (ThO)-Th-232-O-18).