Fragmentation spectroscopy of heterogeneous clusters

Holub-Krappe, E.; Ganteför, Gerd; Bröker, Günther; Ding, A.

doi:10.1007/bf01384867

Cited by 29 publications

(2 citation statements)

References 37 publications

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“…In general, the origin of magic numbers in cluster ions can often be attributed to the dynamics of evaporation processes as well as the relative stabilities of the cluster ions and the neutral distribution . There have been a number of experimental ,− and theoretical ,, studies on mixed cluster ions of the type X + Ar n where X is either an atom or a polyatomic molecule. In the case of a spherical X + such as Ar, Xe, Al, and I, magic numbers below n < 20 have been observed at n = 12 and 18.…”

Section: Discussionmentioning

confidence: 99%

Observation of Magic Numbers within NO/NH₃ Mixed Cluster Ions

1998

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The metastable decomposition of photoionized NO/NH 3 clusters has been investigated employing a reflectron time-of-flight mass spectrometer. The metastable dissociation spectra of the most prominent cluster ion species NO + (NH 3 ) n (3 e n e 28) show that the rate coefficient for the loss of one NH 3 molecule from the cluster rapidly increases up to n ) 13 and thereafter is nearly independent of the cluster size. This is interpreted as evidence of a stable structure that consists of a central NO + ion surrounded by a first solvation shell of 12 NH 3 molecules.

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Section: Discussionmentioning

confidence: 99%

Observation of Magic Numbers within NO/NH₃ Mixed Cluster Ions

1998

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“…[4]). However, the first application of this approach to a cluster reaction in a TPEPICO experiment was reported by Ding and coworkers [5] in a study of heterogenous noble gas clusters only some years ago. No detailed analysis of the KER was given in that study.…”

Section: (Ab) +1 + Hv--* (A B)ff+ I-~(ab)++i -+(Ab) + + Abmentioning

confidence: 96%

On the role of dissociative ionization in the formation of argon dimer ions

Weitzel

Penno

Mähnert

et al. 1994

Z Phys D - Atoms, Molecules and Clusters

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Abstract. The formation of Ar + ions has been investigated by means of the threshold photoelectron photoion coincidence (TPEPICO) technique. Two pathways for the formation of Ar 2 ions are important. One is a direct path via excitation of Rydberg states of Ar 2 with consecutive autoionization. The other path is dissociative ionization of larger argon clusters, in this case argon trimers. These two pathways lead to Ar] ions with different internal energy. The pathways are easily distinguished in the TPEPICO-TOF spectra by the kinetic energy released (KER) in the dissociative ionization. The KER for the reaction Ar~--+Ar2 v +Ar was measured as a function of the photon energy and compared to the KER expected from statistical theory. The agreement is satisfying and confirms that Ar3 + ions do indeed dissociate at the thermochemical threshold. At higher photon energy the excited 2H (3/2)g state of Ar + is also detected from a second component in the KER. By applying a kinetic energy discrimination it is possible to measure cluster ion spectra in the presence of larger dusters but essentially without interference from the latter.

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