Hydrogen scrambling in organic ions is a well known phenomenon and holds special significance for biological systems . The extent of this positional exchange of hydrogen atoms within a molecule depends on the internal energy of the ions and is expected to be greater for metastable ions as compared to ions formed with higher excitation energy which predominantly dissociate into two or more fragments.For smaller molecules, the term intramolecular hydrogen migration is more commonly used to describe this phenomenon. Formation of new bonds (H -H or C -H or O -H) after cleavage of existing C-H and C-O bonds within the ionic precursors of small molecules is extensively reported . Typical examples of such processes is the formation of H + 3 fragment from small alcohols , formation of H 2 O + and H 3 O + from ethanol and formation of CH + 3 from butadiene . The ideas of a roaming H-atom and a roaming H 2 molecule have been put forth to explain the results of time-resolved studies on dissociation of organic molecules.