High harmonic spectroscopy (HHS) is a new tool that offers a view of the electronic structure of molecules.We have shown that HHS can observe molecular dynamics in excited electronic states-unimolecular dissociation [1] and dynamics around a conical intersection [2].These measurements were made in a transient grating geometry, in which amplitude and phase of the emission from the excited state were measured relative to unexcited molecules.If we can fully characterize the amplitude and phase of the emission of the ground state of a molecule, then we have a direct measure of the excited state.The amplitude of the emission is straightforward to measure, but the phase is more challenging.We employ two techniques-two source interferometry and mixed gases-to remove the phase ambiguity.We have fully characterized the amplitude and phase of the emission, in the molecular frame, of bromine molecules.The technique is called LAPIN-Linked Attosecond Phase Interferometry [3].We show how three different orbitals contribute to the emission, much like in CO2 molecules.