Fluorescence spectroscopy of silver clusters formed in rare gas droplets

Ievlev, Dmitry N.; Rabin, Ira; Schulze, W.; Ertl, G.

doi:10.1007/s100530170081

Cited by 10 publications

(11 citation statements)

References 16 publications

(17 reference statements)

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“…In the present study, complexes of small neutral silver clusters with one or a few argon atoms are generated using a pick-up cluster source. , The silver cluster complexes are ionized using an ArF-excimer laser, and the cluster distribution is analyzed in a reflectron time-of-flight mass spectrometer. To probe the vibrational spectra of the neutral silver cluster complexes, they are irradiated with the pulsed far-infrared radiation produced by the Free Electron Laser for Infrared eXperiments (FELIX) before they enter the mass spectrometer.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…However, the special interest in silver clusters is also triggered by more practical arguments such as the investigation of their chemical reactivity − that can be relevant for heterogeneous catalytic reactions or for the understanding of their function in the photographic process . In the last years, the optical properties of small silver clusters either in the gas phase or embedded in matrices have been studied intensly. − …”

Section: Introductionmentioning

confidence: 99%

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Far-Infrared Spectroscopy of Small Neutral Silver Clusters

2006

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The vibrational spectra of Ag(3) and Ag(4) are recorded in the far-infrared between 100 and 220 cm(-1) using multiple photon dissociation spectroscopy of their complexes with Ar atoms. For Ag(3)-Ar two IR active bands are found at 113 and 183 cm(-1), for Ag(4)-Ar one band at 163 cm(-1) and very weak IR activity at 193 cm(-1) are observed. This, together with recent theoretical studies, allows for a reassignment of the controversial vibrational data reported earlier for the bare Ag(3) cluster. The influence of the number of Ar atoms in the complexes on the frequency of the IR active modes is found to be minor. However, the low-frequency IR-active band of Ag(3) shifts with increasing Ar coverage from 113 cm(-1) for Ag(3)-Ar to about 120 cm(-1) for Ag(3)-Ar(4), the value known for Ag(3) embedded in rare gas matrices.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Far-Infrared Spectroscopy of Small Neutral Silver Clusters

2006

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“…47 The method of cluster aggregation has also beeen applied to other types of materials, such as metals or semiconductors: as an example, Ag clusters inside Ar clusters have recently been produced. 48 …”

Section: B Cluster Preparationmentioning

confidence: 99%

Photochemical processes in doped argon-neon core-shell clusters: The effect of cage size on the dissociation of molecular oxygen

Laarmann

Wabnitz

Haeften

et al. 2008

The Journal of Chemical Physics

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The caging effect of the host environment on photochemical reactions of molecular oxygen is investigated using monochromatic synchrotron radiation and spectrally resolved fluorescence. Oxygen doped clusters are formed by coexpansion of argon and oxygen, by pickup of molecular oxygen or by multiple pickup of argon and oxygen by neon clusters. Sequential pickup provides radially ordered core-shell structures in which a central oxygen molecule is surrounded by argon layers of variable thickness inside large neon clusters. Pure argon and core-shell argon-neon clusters excited with ϳ12 eV monochromatic synchrotron radiation show strong fluorescence in the vacuum ultraviolet ͑vuv͒ spectral range. When the clusters are doped with O 2 , fluorescence in the visible ͑vis͒ spectral range is observed and the vuv radiation is found to be quenched. Energy-resolved vis fluorescence spectra show the 2 1 ⌺ + → 1 1 ⌺ + ͑ArO͑ 1 S͒ → ArO͑ 1 D͒͒ transition from argon oxide as well as the vibrational progression A Ј 3 ⌬ u ͑ Ј=0͒ → X 3 ⌺ g − ͑ Љ͒ of O 2 indicating that molecular oxygen dissociates and occasionally recombines depending on the experimental conditions. Both the emission from ArO and O 2 as well the vuv quenching by oxygen are found to depend on the excitation energy, providing evidence that the energy transfer from the photoexcited cluster to the embedded oxygen proceeds via the O 2 + ground state. The O 2 + decays via dissociative recombination and either reacts with Ar resulting in electronically excited ArO or it recombines to O 2 within the Ar cage. Variation of the Ar layer thickness in O 2 -Ar-Ne core-shell clusters shows that a stable cage is formed by two solvation layers.

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“…Lee observed 460 nm luminescence of aqueous silver colloids and powders using a N 2 laser at 337.1 nm and a XeCl gas excimer laser at 308 nm and related the luminescence to surface plasmon resonance and interband transitions. Recently, several groups have reported fluorescence of very small silver clusters (Ag 2 to Ag 30 ) formed in rare gas droplets …”

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confidence: 99%

“…Recently, several groups have reported fluorescence of very small silver clusters (Ag 2 to Ag 30 ) formed in rare gas droplets. 17 More is known about luminescence from gold nanoparticles. While Mooradian 2 interpreted the luminescence of noble metal surfaces as an excitation of electrons from occupied d bands into sp states above the Fermi level (interband transitions), it is now known to be overlaid with numerous chemical effects, especially for luminescence from gold nanoparticles.…”

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confidence: 99%