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High-charge Coulomb explosions of clusters in ultra-dense deuterium D(−1)

Journal article
Authors Leif Holmlid
Published in International Journal of Mass Spectrometry
Volume 304
Pages 51-56
Publication year 2011
Published at Department of Chemistry
Pages 51-56
Language en
Links www.sciencedirect.com.ezproxy.ub.gu...
Keywords Ultra-dense deuterium. Coulomb explosion. Time-of-flight. Cluster
Subject categories Molecular physics, Chemical physics, Spectroscopy, Chemical physics

Abstract

Laser-induced Coulomb explosions of clusters DN in ultra-dense deuterium D(−1) show a broad spectrum of fragmentation processes. For small clusters D3 and D4 symmetric fragmentation processes are often observed. Experiments now show that these clusters fragment by maximum-charge processes, like D44+→4D+, each fragment leaving with 945 eV kinetic energy. This is the case even at low laser pulse intensities of <1012Wcm−2. The facile laser field ionization of these clusters is probably caused by their small size. Such high-charge processes seem to be most common in the superfluid condensed phase. A centrifugal stretching in the clusters is observed, giving 5–8% longer D–D bonds at higher average laser intensity, probably at J≤3. Rotational excitation of D2+ fragments is often apparent at similar J values. This requires strong bonding between the two deuterons, predicted to be close to 700 eV due to strong exchange interaction.

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