Vibrational quenching of the electronic ground state in ThO in cold collisions with 3He
Abstract
We measure the ratio γ of the momentum-transfer to the vibrational quenching cross section for the X (1+), =1, J=0 state of molecular thorium monoxide (ThO) in collisions with atomic 3He between 800 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-body recombination rate constant 3 at 2.4 K, and establish that the binding energy Eb > 4 K.
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