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Phys. Rev. Lett. 77, 4532 - 4535 (1996)

Spin Polarized Alkali Clusters: Observation of Quartet States of the Sodium Trimer

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J. Higgins, W. E. Ernst, C. Callegari, J. Reho, K. K. Lehmann, and G. Scoles
Department of Chemistry, Princeton University, Princeton, New Jersey 08544

M. Gutowski
Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352
and Department of Chemistry, University of Gdańsk, 80-952 Gdańsk, Poland

Received 31 May 1996

Using helium cluster-isolation spectroscopy we have prepared and characterized the lowest quartet state ( 14A2′) of the sodium trimer. Upon excitation to the 24E′ electronic state, laser induced fluorescence excitation and emission spectra have been obtained. With the aid of ab initio calculations, the spectra have been vibronically assigned and new insights on the nonadditivity of van der Waals interactions have been obtained. It is found that approximately 80% of the interaction energy in the 14A2′ state of Na3 is due to nonadditive effects.


©1996 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.77.4532
DOI: 10.1103/PhysRevLett.77.4532
PACS: 36.40.Mr, 33.20.Kf

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