S

Krückeberg, Fritz; Spaniol, Otto

doi:10.1007/978-3-662-30399-3_19

Cited by 3 publications

(2 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the abundance spectra after electron bombardment of mass-selected Ag + n led to the discovery of a geometric shell at n = 55 in the vicinity of electric shells [51]. Finally, by use of the electron beam gold cluster dianions have been produced recently [52].…”

Section: Previous Current and Future Studiesmentioning

confidence: 99%

The Mainz Cluster Trap

Schweikhard

Krückeberg

Lützenkirchen

et al. 1999

The European Physical Journal D

View full text Add to dashboard Cite

When cluster ions are stored by electromagnetic forces they are available in the gas phase for extended preparations and investigations. Over the last decade a Penning trap (Ion Cyclotron Resonance) apparatus has been constructed and further developed with respect to metal cluster research at the Institute of Physics at Mainz. It allows to capture and accumulate ion bunches injected from an external cluster source and to manipulate the ions' motion, i.e. select and center the clusters of interest. The interactions that have been investigated include those with inert and chemically reactive gases, photons and electrons. Multiple mass spectrometric steps such as fragment ion selection can be used to disentangle complex reactions or interfering reaction channels. A brief introduction into the principles of ion trapping and a short overview of the history and experimental setup at Mainz are given. The advantages of ion storage with respect to extended preparation of the trapped cluster ensemble and with respect to extended reaction periods are exemplified by measurements of the collision induced dissociation of Ag 2+ 16 and by time-resolved observation of the photodissociation of V + 12 . References are given both to the investigations performed at the Mainz Cluster Trap as well as to other experimental arrangements and measurements.PACS. 36.40.Wa Charged clusters -07.75.+h Mass spectrometry and related techniques

show abstract

Section: Previous Current and Future Studiesmentioning

confidence: 99%

The Mainz Cluster Trap

Schweikhard

Krückeberg

Lützenkirchen

et al. 1999

The European Physical Journal D

View full text Add to dashboard Cite

show abstract

“…10 While the importance of the electronic degrees of freedom in the dissociation kinetics of metal clusters has been noted previously, 1,10-13 the issue remains among the least understood aspects of the problem. For example, a large discrepancy between the binding energies for Cu and Al cluster cations measured by different methods [14][15][16][17][18][19] has recently been blamed on the possible involvement of excited electronic states in photodissociation. 18 a͒ Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Dissociation kinetics of metal clusters on multiple electronic states including electronic level statistics into the vibronic soup

Shvartsburg

Siu

2001

The Journal of Chemical Physics

View full text Add to dashboard Cite

Articles you may be interested inDissociation of internal energy-selected methyl bromide ion revealed from threshold photoelectron-photoion coincidence velocity imaging Hydrogen exchange kinetics in NaAlH 4 catalyzed in different decomposition states J. Appl. Phys. 95, 7748 (2004); 10.1063/1.1751634 Excited-state diffusion-influenced reversible association-dissociation reaction: Brownian dynamics simulation in three dimensionsModeling the delayed dissociation of clusters had been over the last decade a frontline development area in chemical physics. It is of fundamental interest how statistical kinetics methods previously validated for regular molecules and atomic nuclei may apply to clusters, as this would help to understand the transferability of statistical models for disintegration of complex systems across various classes of physical objects. From a practical perspective, accurate simulation of unimolecular decomposition is critical for the extraction of true thermochemical values from measurements on the decay of energized clusters. Metal clusters are particularly challenging because of the multitude of low-lying electronic states that are coupled to vibrations. This has previously been accounted for assuming the average electronic structure of a conducting cluster approximated by the levels of electron in a cavity. While this provides a reasonable time-averaged description, it ignores the distribution of instantaneous electronic structures in a ''boiling'' cluster around that average. Here we set up a new treatment that incorporates the statistical distribution of electronic levels around the average picture using random matrix theory. This approach faithfully reflects the completely chaotic ''vibronic soup'' nature of hot metal clusters. We found that the consideration of electronic level statistics significantly promotes electronic excitation and thus increases the magnitude of its effect. As this excitation always depresses the decay rates, the inclusion of level statistics results in slower dissociation of metal clusters.

show abstract

Computereinsatz im Marktforschungsprozeß

Hoepner¹

1994

Computereinsatz Bei Befragungen

View full text Add to dashboard Cite

S

Cited by 3 publications

References 22 publications

The Mainz Cluster Trap

The Mainz Cluster Trap

Dissociation kinetics of metal clusters on multiple electronic states including electronic level statistics into the vibronic soup

Computereinsatz im Marktforschungsprozeß

Contact Info

Product

Resources

About