The intermolecular modes of water dimer and their harmonic frequencies, calculated using the ASP-W4 potential, are listed below. Click on the link to see an animated image of the vibration, constructed using Matt Hodges' XMakemol program.

1. A'' 566 cm-1
Out-of-plane H-bond shear
2. A' 408 cm-1
In-plane H-bond shear
3. A' 192 cm-1
In-plane H-bond bend
4. A' 177 cm-1
H-bond stretch
5. A'' 83 cm-1
Out-of-plane H-bond bend
6. A'' 147 cm-1
H-bond torsion