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Mass spectrometric studies on lead compound clusters
A303 121
Surface Science 156 (1985) 121-125 North-Holland, Amsterdam EVAPORATION
OF SMALL CLUSTERS
O F N O B L E G A S E S BY
IONIZATION J.J. S,h, E N Z , J . M . S O L E R a n d N . G A R C I A
Departamento de ~sica Fundamental, Universidad Autbnoma de Madrid, 28049 Madrid, Spain Received 10 July 1984 We have studied by molecular dynamics simulation the evolution of rare-gas clusters after their ionization. We find that, assuming the formation of a molecular dimer ion in the cluster, complete dissociation of small clusters occurs, in agreement with recent experimental results, and with mass spectra of Ar and Xe.
126
Surface Science 156 (1985) 126-133 North-Holland, Amsterdam
MASS SPECTROMETRIC CLUSTERS H.J. N O V I N S K Y , E. R E C K N A G E L
STUDIES
R. P F L A U M ,
ON LEAD COMPOUND
P. P F A U , K . S A T T L E R
and
Fakult~tt ff~r Physik, Universiti~t Konstanz, D-7750 Konstanz, Fed. Rep. of Germany Received 10 July 1984; accepted for publication 20 August 1984 Clusters from PbO and PbCI 2 have been generated by condensation of the vapours in cold He gas. Different lattice energies E~ of the corresponding solids are displayed in the cluster stabilities. For PbO, with relatively high E I, doubly charged clusters are stable down to the trimer. For PbCl z, with lower E I, a critical size for Coulomb explosion n 2 . = 10 is found. After ionization, oxide or halogen atoms split off. The dissociation rates depend on the original cluster temperature, on the energy of the ionizing electrons and on the cluster sizes. Spectra from lead oxide clusters show an irregularity at n = 13, either if singly or doubly charged.
134 PRODUCTION
Surface Science 156 (1985) 134-139 North-Holland, Amsterdam AND STUDY OF METAL CLUSTER
IONS
P. F A Y E T a n d L. W O S T E
Institut de Physique Expbrimentale, Ecole Polytechnique Fbdbrale de Lausanne, CH-1015 Lausanne, Switzerland Received 10 July 1984 Sputtered metal clusters are energy analyzed, mass filtered and injected into a RF quadrupole drift tube. This confinement allowed us to perform collision-induced dissociations, chemical reactions and photofragmentation experiments on clusters of a single size. The results give an insight into the dynamic properties of charged metal aggregates.
Surface Science 156 (1985) 121-125 North-Holland, Amsterdam EVAPORATION
OF SMALL CLUSTERS
O F N O B L E G A S E S BY
IONIZATION J.J. S,h, E N Z , J . M . S O L E R a n d N . G A R C I A
Departamento de ~sica Fundamental, Universidad Autbnoma de Madrid, 28049 Madrid, Spain Received 10 July 1984 We have studied by molecular dynamics simulation the evolution of rare-gas clusters after their ionization. We find that, assuming the formation of a molecular dimer ion in the cluster, complete dissociation of small clusters occurs, in agreement with recent experimental results, and with mass spectra of Ar and Xe.
126
Surface Science 156 (1985) 126-133 North-Holland, Amsterdam
MASS SPECTROMETRIC CLUSTERS H.J. N O V I N S K Y , E. R E C K N A G E L
STUDIES
R. P F L A U M ,
ON LEAD COMPOUND
P. P F A U , K . S A T T L E R
and
Fakult~tt ff~r Physik, Universiti~t Konstanz, D-7750 Konstanz, Fed. Rep. of Germany Received 10 July 1984; accepted for publication 20 August 1984 Clusters from PbO and PbCI 2 have been generated by condensation of the vapours in cold He gas. Different lattice energies E~ of the corresponding solids are displayed in the cluster stabilities. For PbO, with relatively high E I, doubly charged clusters are stable down to the trimer. For PbCl z, with lower E I, a critical size for Coulomb explosion n 2 . = 10 is found. After ionization, oxide or halogen atoms split off. The dissociation rates depend on the original cluster temperature, on the energy of the ionizing electrons and on the cluster sizes. Spectra from lead oxide clusters show an irregularity at n = 13, either if singly or doubly charged.
134 PRODUCTION
Surface Science 156 (1985) 134-139 North-Holland, Amsterdam AND STUDY OF METAL CLUSTER
IONS
P. F A Y E T a n d L. W O S T E
Institut de Physique Expbrimentale, Ecole Polytechnique Fbdbrale de Lausanne, CH-1015 Lausanne, Switzerland Received 10 July 1984 Sputtered metal clusters are energy analyzed, mass filtered and injected into a RF quadrupole drift tube. This confinement allowed us to perform collision-induced dissociations, chemical reactions and photofragmentation experiments on clusters of a single size. The results give an insight into the dynamic properties of charged metal aggregates.