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We measure the ratio $\gamma$ of the momentum-transfer to the vibrationalquenching cross section for the X ($^1\Sigma^+$), $\nu=1$, $\mathrm{J=0}$ stateof molecular thorium monoxide (ThO) in collisions with atomic $^3$He between800 mK and 2.4 K. We observe indirect evidence for ThO--He van der Waals'complex formation, which has been predicted by theory. We determine the 3-bodyrecombination rate constant $\Gamma_3$ at 2.4 K, and establish that the bindingenergy E$_b >$ 4 K.

Vibrational quenching of the electronic ground state in ThO in cold collisions with $^3$He