The fundamental of the HOH bending mode is predominantly influenced by hydrogen bonding in pure liquid water. Similar to the stretching mode, the peak position of the bending mode shifts in response to variations in hydrogen bond network environment. Therefore, the bending mode serves as an indicator of how accurately the hydrogen bond network is depicted. The DPMD model produces a peak at 1643.8 cm -1 , while the SPC/Fw model's peak occurs at 1471.4 cm -1 . The close agreement of the bending frequency between the DPMD model and the experiment suggests that the model accurately produces the bending motion of molecules. The trend observed in the bending mode frequency should be related to the shift of the cooperative dielectric relaxation, which is influenced by the critical role played by the HOH bending mode in transferring intramolecular energy to the hydrogen bond network .