Absorption spectroscopy and photodissociation dynamics of small helium cluster ions

The optical absorption of size-selected helium cluster ions was studied via photofragmentation spectroscopy. Absorption cross sections were measured for He+n (n=3, 4, 10, 21, and 30). A broad absorption peak was found, which for He+3 is centered at ≊5.3 eV, and which with increasing cluster size shi...

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Bibliographic Details
Published in:The Journal of chemical physics 1995-06, Vol.102 (22), p.8773-8779
Main Authors: Haberland, H., Issendorff, B. v., Fröchtenicht, R., Toennies, J. P.
Format: Article
Language:English
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Summary:The optical absorption of size-selected helium cluster ions was studied via photofragmentation spectroscopy. Absorption cross sections were measured for He+n (n=3, 4, 10, 21, and 30). A broad absorption peak was found, which for He+3 is centered at ≊5.3 eV, and which with increasing cluster size shifts slightly to the red. In addition, the kinetic energy release to the ionized and neutral photofragments was measured by a time-of-flight technique for cluster sizes between n=3 and 10. From the energy balance the total binding energy of the He+3 trimer ion was determined to be 2.6±0.15 eV. The results further indicate that a charged linear trimer acts as a core molecule for the sizes n=4–7. For n≳7, an additional isomer with a tetramer core is identified. The results are compared with recent ab initio calculations.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.468980