The unimolecular dissociation of is investigated by exciting the molecule in the region of its band and probing the resulting OH fragments using laser-induced fluorescence. The measured OH fragment rotational and translational energies are used to determine the bond dissociation energy, which we estimate to be . Combining this value with the known heats of formation of the fragments also gives an estimate for the heat of formation of which at we determine to be . This experimental value is in good agreement with the results of ab initio calculations carried out at the CCSD(T)/complete basis set limit which finds the heat of formation of at to be .
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