Radiative cooling of Al4− and Al5− in a cryogenic environment

Lange, Michael; Froese, Michael Wayne; Menk, Sebastian; Bing, Dennis; Fellenberger, Florian; Grieser, Manfred; Laux, Felix; Orlov, Dmitri A.; Repnow, Roland; Sieber, Thomas; Toker, Y.; von Hahn, Robert; Wolf, Andreas; Blaum, Klaus

doi:10.1088/1367-2630/14/6/065007

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Radiative cooling of Al₄⁻ and Al₅⁻ in a cryogenic environment

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Lange, Michael
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Froese, Michael Wayne
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Menk, Sebastian
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Bing, Dennis
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Fellenberger, Florian
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Grieser, Manfred
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Laux, Felix
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Orlov, Dmitri A.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Repnow, Roland
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Sieber, Thomas
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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von Hahn, Robert
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Wolf, Andreas
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum, Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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http://iopscience.iop.org/1367-2630/14/6/065007/
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Citation

Lange, M., Froese, M. W., Menk, S., Bing, D., Fellenberger, F., Grieser, M., et al. (2012). Radiative cooling of Al₄⁻ and Al₅⁻ in a cryogenic environment. New Journal of Physics, 14(June 2012): 065007, pp. 1-16. doi:10.1088/1367-2630/14/6/065007.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-A32B-C

Abstract

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.