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When fragile molecules such as glycine, polyglicine, alkanes, andalkanethiols are embedded in liquid helium nanodroplets, electron-impactionization of the beam leads to fragmentation which is as extensive as that ofisolated gas-phase molecules. However, it turns out that if a few molecules ofwater are co-embedded with the peptide and alkane chains, their fragmentationis drastically reduced or completely eliminated. On the other hand, thefragmentation of alkanethiols remains unaffected. On the basis of theseobservations, it is proposed that the fragmentation "buffering" effect maycorrelate with the magnitude of the impurity's electric dipole moment, whichsteers the migration of the ionizing He^+ hole in the droplet.

Suppressing the fragmentation of fragile molecules in helium nanodroplets by co-embedding with water: Possible role of the electric dipole moment