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AMER INST PHYSICS
DOI: 10.1063/5.0000305
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Water clusters and mixed formic acid-water clusters produced in molecular beam have been tagged by one odium atom and investigated by mass spectrometry and tunable UV laser photoionization. Two series of clusters Na-(H2O)(n) and Na-(HCOOH)(H2O)(n) have been detected at various photon energies, from their appearance threshold in the mass spectrum up to 0.5 eV above. The appearance energies of the mixed clusters, as a function of cluster size, show a flattening shifted toward higher energies with respect to the pure water cluster. This spectroscopic signature is an indication of a significant contribution from the acid molecule to the water cluster and may be useful to predict more carefully the structure of ionized and neutral clusters.
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