Desorption of metal atoms with laser light: Mechanistic studies

Hoheisel, W.; Vollmer, Michael; Träger, F.

doi:10.1103/physrevb.48.17463

Cited by 74 publications

(61 citation statements)

References 34 publications

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“…This resonant behavior has long been supposed to be related to the surface plasmon resonances of alkali clusters [32]. However, a recent study points out that this kind of resonant desorption may also result from the localized resonant excitation of certain bonding sites of alkali atoms on the alkali cluster surface and the desorption described in Ref.…”

Section: Discussionmentioning

confidence: 94%

Classification of Light-Induced Desorption of Alkali Atoms in Glass Cells Used in Atomic Physics Experiments

Hatakeyama

Wilde

Fukutani

2006

e-J. Surf. Sci. Nanotechnol.

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We attempt to provide physical interpretations of light-induced desorption phenomena that have recently been observed for alkali atoms on glass surfaces of alkali vapor cells used in atomic physics experiments. We find that the observed desorption phenomena are closely related to recent studies in surface science, and can probably be understood in the context of these results. If classified in terms of the photon-energy dependence, the coverage and the bonding state of the alkali adsorbates, the phenomena fall into two categories: It appears very likely that the neutralization of isolated ionic adsorbates by photo-excited electron transfer from the substrate is the origin of the desorption induced by ultraviolet light in ultrahigh vacuum cells. The desorption observed in low temperature cells, on the other hand, which is resonantly dependent on photon energy in the visible light range, is quite similar to light-induced desorption stimulated by localized electronic excitation on metallic aggregates. More detailed studies of light-induced desorption events from surfaces well characterized with respect to alkali coverage-dependent ionicity and aggregate morphology appear highly desirable for the development of more efficient alkali atom sources suitable to improve a variety of atomic physics experiments.

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Section: Discussionmentioning

confidence: 94%

Classification of Light-Induced Desorption of Alkali Atoms in Glass Cells Used in Atomic Physics Experiments

Hatakeyama

Wilde

Fukutani

2006

e-J. Surf. Sci. Nanotechnol.

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“…The results summarized above permit to draw several conclusions [4][5][6]. First, desorption obviously results from electronic excitation of the clusters.…”

Section: Methodsmentioning

confidence: 87%

“…For sodium and potassium the kinetic energies were found to be 0.4_+0.05 eV and 0.13_+0.02 eV, respectively. Small but significant changes of the energy as a function of wavelength have been observed for sodium [6].…”

Section: Methodsmentioning

confidence: 94%

“…The experimental arrangement has been discussed in detail elsewhere [5,6]. The experiments were performed in an ultrahigh vacuum system.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore it had been concluded [5] that surface plasmons play an important role for stimulating desorption. However, a detailed comparison between experiment and theory on the basis of new data available now reveals deviations [6]. The most remarkable difference is observed for large cluster radii.…”

Section: Local Versus Nonlocal Theorymentioning

confidence: 97%

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Interplay between collective and single electron excitations in large metal clusters

Götz

Hoheisel

Träger

et al. 1993

Z Phys D - Atoms, Molecules and Clusters

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Abstract:Collective and single electron excitations of large metal clusters supported on transparent substrates are investigated. The applied experimental techniques include extinction spectroscopy and laser induced dissociation accompanied by the ejection of individual atoms. The optical spectra depend on the electromagnetic far field and reflect collective electron excitations of the conduction electrons, i.e. surface plasmons. Dissociation, however, is correlated to repulsive single electron energy levels. The characteristics of these localized excitations indicate a strong influence of collective excitations. In particular, it is found that nonlocal optical effects are important. In this picture surface plasmons catalytically enhance the number of single electron excitations and therefore of the metal atoms ejected as a result of the absorption of visible light. Results will be presented, which illustrate this interplay between collective and single electron excitations.

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Visible‐laser desorption/ionization on gold nanostructures

et al. 2007

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In this report, we describe the visible-laser desorption/ionization of biomolecules deposited on gold-coated porous silicon and gold nanorod arrays. The porous silicon made by electrochemical etching was coated with gold using argon ion sputtering. The gold nanorod arrays were fabricated by electrodepositing gold onto a porous alumina template, and the subsequent partial removal of the alumina template. A frequency-doubled/tripled Nd : YAG laser was used to irradiate the gold nanostructured substrate, and the desorbed molecular ions were mass-analyzed by a time-of-flight mass spectrometer. The desorption/ionization of biomolecules for both substrates was favored by the use of the 532-nm visible-laser, which is in the range of the localized surface plasmon resonance of the gold nanostructure. The present technique offers a potential analytical method for low-molecular-weight analytes that are rather difficult to handle in the conventional matrix-assisted laser desorption/ionization (MALDI) mass spectrometry.

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Desorption of metal atoms with laser light: Mechanistic studies

Cited by 74 publications

References 34 publications

Classification of Light-Induced Desorption of Alkali Atoms in Glass Cells Used in Atomic Physics Experiments

Classification of Light-Induced Desorption of Alkali Atoms in Glass Cells Used in Atomic Physics Experiments

Interplay between collective and single electron excitations in large metal clusters

Visible‐laser desorption/ionization on gold nanostructures

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