STUDIES OF METASTABLY EXCITED HELIUM CLUSTERS

T. Jiang, C. Kim and J.A. Northby
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T. Jiang: Physics Department, University of Rhode Island, Kingston, RI 02881, USA
C. Kim: Physics Department, University of Rhode Island, Kingston, RI 02881, USA
J.A. Northby: Physics Department, University of Rhode Island, Kingston, RI 02881, USA

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 377-381

Abstract: Helium clusters containing long-lived metastably excited helium molecules are produced by electron impact and formed into a beam. The delayed release of excited molecules from clusters after a long flight path is measured. The release rate can be enhanced by an intersecting monochromatic infrared light beam. The frequency dependence of the light-induced signal allows us to identify the excitation as the ground-state triplet helium${\rm He}_2^*$molecule$\left(a^3 \sum_u^+\right)$. The rotational structure of thea→btransition is noticeably different from the same line in bulk helium, and may provide information about the nature of the cluster in the future.

Date: 1996
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DOI: 10.1142/S0218625X96000681

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