Liquid water's rich sub-picosecond vibrational dynamics arise from the interplay of different
high-and low-frequency modes evolving in a strong yet fluctuating hydrogen bond network.
Recent studies of the OH stretching excitations of H 2 O indicate that they are delocalized
over several molecules, raising questions about whether the bending vibrations are similarly
delocalized. In this paper, we take advantage of an improved 50 fs time-resolution and
broadband infrared (IR) spectroscopy to interrogate the 2D IR lineshape and spectral …