Photochemistry in rare gas clusters

Möller, Thomas; Haeften, K. von; Laarman, T.; Pietrowski, R. von

doi:10.1007/978-3-642-88188-6_2

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“…It is well known that desorption of excited atoms and molecules play an important role in the relaxation cascade of light rare gas clusters (He, Ne) photoexcited in the VUV spectral range and which was also observed for small Ar clusters. 10,11 The aim of the present contribution is to provide experimental data on hindered desorption processes in Ar M Kr K Ne N clusters by modifying surface properties, which shed light on electronic energy dissipation processes in doped clusters and in particular on the condensation of doped atoms in multishell structures.…”

Section: Introductionmentioning

confidence: 99%

Electronic Energy Dissipation Processes in Doped Rare Gas Clusters With a Shell-Like Structure

Laarmann¹,

Haeften²,

Wabnitz³

et al. 2002

Surf. Rev. Lett.

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Energy relaxation processes of photoexcited Ar M clusters (M < 50) covered with a shell of Kr atoms (up to 30 atoms) which are embedded in large Ne N clusters (N = 3500) are investigated with energy-resolved fluorescence spectroscopy. In the energy range of the Ne cluster absorption (16.5–18 eV) a strong energy transfer to the embedded Ar subcluster is observed, which results in desorption of electronically excited Ar * atoms. Ar * move through the Ne cluster, desorb and emit visible and near-infrared light in the vacuum ( 4p → 4s ). By coating the Ar clusters with Kr atoms, the Ar lines disappear and 5p → 5s transitions of Kr become dominant. Additionally, new bands occur, which are assigned to transitions of perturbed atomic Ar 4p states inside Ne clusters. A simple kinematic model is suggested to describe the suppression of desorption of excited Ar atoms from Ne clusters.

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Section: Introductionmentioning

confidence: 99%