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