Conclusions :

• No dramatic difference in the dynamics of anion-water and water-water hydrogen bonds are found for Cl- and Br- ions. Solvation shells of these ions are not rigid.

• For OH- in water, HB dynamics in the hydration shell determines the rate of proton transfer.

• For OH- in water clusters, proton transfer occurs involving water molecules with dangling hydrogens.

• At liquid-vapour interface, some of water dangling hydrogens are docked by ammonia nitrogens.

• Hydrogen bond dynamics at aqueous surface is found to be somewhat slower than that in bulk water.

• Hydrogen bonds are also found to play a role in the binding of excess electrons in water-ammonia clusters