For H_2O such local mode phenomena is due to the strong unharmonic of potential energy.For H_2O_2, besides unharmonic, it is further due to a complicate coupling between these two OH vibration mode.

• 2O分子的这种现象是由于强的势能非谐性造成的；而H_2O_2分子除上述原因外；还与两个OH键振动模间的复杂耦合有关.