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<p>Two-dimensional infrared spectroscopy (2D-IR) probes the local solvent structure and dynamics of the nu<sub>3</sub> mode (BH antisymmetric stretch) of borohydride (BH<sub>4</sub><sup>-</sup> ) in aqueous solution. The 2D-IR spectra of the BH stretches have broad and overlapping bands. Vibrational energy relaxation occurs on a 2 ps timescale. Energy that is initially deposited in BH stretching modes and directly in the solvent generates a long lived hot ground state. Before the hot grounddoi:10.26434/chemrxiv.9874694 fatcat:p6yq2osrhngkvlas5sjxwb56sm