Radiative cooling of Al?4 and Al?5 in a cryogenic environment

M. Lange, M. W. Froese, S. Menk, D. Bing, F. Fellenberger, M. Grieser, F. Laux, D. A. Orlov, R. Repnow, T. Sieber, Y. Toker, R. Von Hahn, A. Wolf, K. Blaum

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16 Scopus citations


We have investigated the radiative cooling of initially hot Al - 4 and Al - 5 cluster anions during storage in a cryogenic ion beam trap at an ambient temperature of <15 K. By applying a statistical rate model to the ions' measured delayed detachment rate following excitation with a laser, we have obtained their vibrational temperature as a function of cooling time. The temperature curves for Al - 4 suggest that the vibrational cooling slows down considerably once the ion reaches approximately room temperature. This suggests the participation of transitions from recently found low-lying electronic states of the anion in the cooling process, prior to reaching approximately room temperature. The experimental results for Al - 5 suggest slightly slower radiative cooling than for Al?4

Original languageEnglish
Article number065007
JournalNew Journal of Physics
StatePublished - Jun 2012
Externally publishedYes


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