Photoionization thresholds of rare gas clusters

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

doi:10.1063/1.457215

Cited by 85 publications

(50 citation statements)

References 22 publications

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“…These fast electrons are attributed to the lower ionization energy of rare gas clusters. 60 Figure 7 also provides a more global view of the trends exhibited by feature C. At high electron energy, this feature extends to the sharp features A and B for both dopants; therefore, it is wider toward high energy in Xe-doped droplets. Below 4 eV, the shape of feature C is largely independent of dopant and depends only on source temperature.…”

Section: Resultsmentioning

confidence: 93%

Photoelectron Imaging of Helium Droplets Doped with Xe and Kr Atoms

et al. 2008

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Helium droplets doped with Xe and Kr atoms were photoionized by using VUV synchrotron radiation from the Advanced Light Source and the resulting photoelectron images were measured. A wide range of He droplet sizes, photon energies, and dopant pick-up conditions was investigated. Significant ionization of dopants was observed at 21.6 eV, the absorption maximum of 2p 1 P 1 electronic excited state of He droplets, indicating an indirect ionization mechanism via excitation transfer. The photoelectron images and spectra reveal multiple photoionization mechanisms and pathways for the photoelectrons to escape the droplet. Specifically, they show sets of sharp peaks assigned to two mechanisms for Penning ionization of the dopant by He* in which the photoelectrons leave the droplet with no detectable energy loss, a broad, intense feature representing electrons that undergo significant energy loss, and a small amount of ultraslow electrons that may result from electron trapping at the droplet surface. The droplet-size dependence of the broad, intense feature suggests the development of the conduction band edge in the largest droplets seen here (〈N〉 ≈ 250,000).

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Section: Resultsmentioning

confidence: 93%

Photoelectron Imaging of Helium Droplets Doped with Xe and Kr Atoms

et al. 2008

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“…This in first place is a final state effect, as the Ar dimer cation possesses some bound states [1][2][3]. For clusters growing to about thirty atoms, from mass resolved appearance energy measurements also an influence of initial state effects was suggested [4,5]. These experiments were detailed, but did not yield insight to properties of the electronic structure beyond the position of the ionization potential (IP), or the vacuum level in a solid state terminology.…”

Section: Introductionmentioning

confidence: 99%

3pvalence photoelectron spectrum of Ar clusters

et al. 2009

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The shape of the outer valence (3p) photoelectron spectrum of Ar clusters is investigated by vacuum ultraviolet photoionization with synchrotron radiation. We show the dependence of the spectrum on cluster size, and the change of its shape with photon energy. Inelastic losses due to intracluster photoelectron scattering are most important for changes in the photoelectron main line, and explain the appearance of additional peaks. A comparison of our results to earlier work on bulk condensed Ar and Ar thin films is given. Evidence for a deviation of the photoionization cross sections for clusters from the atomic ones has not been found.

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“…6 These calculations were in good agreement with measurements of the ionization potential of Xe N clusters. 22 Charge solvation has also been studied for liquid and solid rare gases. 3 There are no optical features in the bulk of solid rare gases because the charged vacancies are neutralised too fast.…”

Section: Resultsmentioning

confidence: 99%

Evolution of the charge localization process in xenon cluster ions: From tetramer to dimer cores as a function of cluster size

Laarmann

Kanaev²,

Haeften

et al. 2002

The Journal of Chemical Physics

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The charge localization process in Xe N ϩ cluster ions (Nϭ40-20 000) is investigated with fluorescence spectroscopy methods. New discrete and continuous luminescence bands in the visible and near infrared spectral range are observed and are assigned to radiative transitions of ionic dimers, trimers and tetramers inside Xe clusters. The bands are related to the 5p 5 2 P 1/2 →5p 5 2 P 3/2 transition of electronically excited atomic Xe ions and the 6p→6s transitions of electronically excited Xe neutrals. The dependence of the size of the ionic centers on the Xe cluster size is discussed. In large clusters discrete lines are due to embedded dimer emission and they are identified as 2(1/2) u →1(3/2) g transitions between different vibrational levels. Line positions are blue-shifted by 30 (Ϯ1) meV with respect to free molecular dimer ions. The energy shift is due to the interaction of the surrounding neutral Xe cluster atoms with the embedded ionic Xe molecules.

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Photoionization thresholds of rare gas clusters

Cited by 85 publications

References 22 publications

Photoelectron Imaging of Helium Droplets Doped with Xe and Kr Atoms

Photoelectron Imaging of Helium Droplets Doped with Xe and Kr Atoms

3pvalence photoelectron spectrum of Ar clusters

Evolution of the charge localization process in xenon cluster ions: From tetramer to dimer cores as a function of cluster size

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