Water clusters and mixed formic acid-water clusters produced in molecular beam have been tagged by one sodium atom and investigated by mass spectrometry and tunable UV laser photoionization. Two series of clusters Na-(HO) and Na-(HCOOH)(HO) 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.
Clusters tagged by alkali metals
Di Palma TM;Gaele MF;
2020
Abstract
Water clusters and mixed formic acid-water clusters produced in molecular beam have been tagged by one sodium atom and investigated by mass spectrometry and tunable UV laser photoionization. Two series of clusters Na-(HO) and Na-(HCOOH)(HO) 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
