On ionisation induced unimolecular dissociation of sodium clusters

Kappes, Manfred M.; Schär, Martin; Schumacher, Ernst; Vayloyan, Arthur

doi:10.1007/bf01385467

Cited by 27 publications

(10 citation statements)

References 24 publications

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“…The photophysics of metal clusters is an important subject which has proved relatively elusive despite intense effort and interest [1][2][3][4][5]. Whereas resonance enhanced multiphoton ionization has provided a wealth of information for various organic substances, trimers are the largest metal clusters which have been successfully studied via this technique [6,7].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the stabilities of neutral and ionic lead and lead-antimony clusters under single and multiphoton ionization conditions

Farley

Ziemann

Castleman

1989

Z Phys D - Atoms, Molecules and Clusters

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The fluence dependence of lead cluster ion distributions at 222 nm and 308 nm reveal markedly different behavior. Results obtained at 308 nm display a simple uniform increase in intensity with higher laser fluence with tittle change in relative intensities. At 222 rim, however, a significant transformation is found from a markedly different low fluence distribution to a high fluence pattern, which is essentially indistinguishable from that observed at 308 nm. It is concluded that mass spectra obtained at 308 nm, regardless of fluence, or at 222 nm and high fluence contain appreciable contributions from fragmentation. Hence, under these conditions the mass spectra are found to be dominated by cluster ion stabilities. Magic numbers observed at both high and low fluence correspond well to those obtained using electron-impact ionization, and in many instances parallel the magic numbers characteristic of rare-gas clusters. This suggests the stabilities of both neutral and monovalent cationic lead clusters are largely determined by closepacking considerations, and are not appreciably influenced by electronic structure. Similar preferences for close-packed structures are also found for mixed lead-antimony clusters containing one or two antimony atoms that are ionized using high fluence 308 nm excitation.

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Section: Introductionmentioning

confidence: 99%

Investigation of the stabilities of neutral and ionic lead and lead-antimony clusters under single and multiphoton ionization conditions

Farley

Ziemann

Castleman

1989

Z Phys D - Atoms, Molecules and Clusters

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“…Two main approaches are generally taken in the literature: ͑i͒ the PI ͑͒ data set is fit by iterative forward convolution of lamp intensity, monochromator slit function, and a simple ͑usually step function͒ trial PIE͑͒. 30 Variation of the PIE onset yields a best fit of the photoion yield threshold region, and in turn an adiabatic ionization potential. This approach completely neglects internal excitation.…”

Section: Resultsmentioning

confidence: 99%

On the ground and electronically excited states of Na3O: Theory and experiment

Hampe

Koretsky

Gegenheimer

et al. 1997

The Journal of Chemical Physics

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Na 3 O has been generated by reacting preformed sodium clusters with O 2 and N 2 O in a crossed beam pickup arrangement. This ''superalkali'' species was probed by photodepletion spectroscopy coupled with one-photon ionization mass spectroscopy to yield: ͑i͒ a first measure of visible/NIR region photodissociation cross sections showing several broad absorption features, ͑ii͒ a rough determination of the ground state dissociation energy (1.48Ϯ0.04 eV), as well as ͑iii͒ a remeasurement of the ionization potential (3.69Ϯ0.15 eV). The experimental investigations were supplemented by quantum chemical ab initio calculations employing coupled-cluster methods for ground and excited states of Na 3 O. Experiment and theory are in good agreement, allowing a tentative assignment of the Na 3 O depletion spectrum while providing further evidence for the computed D 3h ground state. Observed and calculated dipole-allowed electronic transitions are discussed in terms of the unusual electronic structure of this nominally one excess-electron species.

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“…This configuration ensures near threshold cluster ionization, associated with little fragmentation [26]. This configuration ensures near threshold cluster ionization, associated with little fragmentation [26].…”

Section: Cluster Beam Photodepletion Spectroscopymentioning

confidence: 94%

Photoabsorption spectra ofs 1-electron metal clusters

Wang

Pollack

Hunter

et al. 1991

Z Phys D - Atoms, Molecules and Clusters

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Collinear laser/molecular beam photodepletion spectroscopy has developed into a powerful tool for the determination of electronic absorption in neutral alkali metal clusters free of perturbing matrix effects. We briefly discuss the method, present data on selected Na~ and LiyNax_ y, x < 20, contrast measurements with the known optical response of larger colloidal metal clusters, compare microcluster spectra with the predictions of various models and speculate on future experimental and theoretical developments in this field.

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On ionisation induced unimolecular dissociation of sodium clusters

Cited by 27 publications

References 24 publications

Investigation of the stabilities of neutral and ionic lead and lead-antimony clusters under single and multiphoton ionization conditions

Investigation of the stabilities of neutral and ionic lead and lead-antimony clusters under single and multiphoton ionization conditions

On the ground and electronically excited states of Na3O: Theory and experiment

Photoabsorption spectra ofs 1-electron metal clusters

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