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Characterization of theX 2 ∑ +u state of7Li −2 via negative ion photoelectron spectroscopy

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Zeitschrift für Physik D Atoms, Molecules and Clusters

Abstract

The negative ion photoelectron spectrum of7Li −2 is reported at 488 nm (2.540 eV). Three electronic bands are observed in this spectrum and are assigned to the following photodetachment transitions:7Li2,X 1 ∑ + g +e − ←7Li −2 ,X 2 ∑ + u ;7Li2,a 3 ∑ + u +e − ←7Li −2 ,X 2 ∑ + u ; and7Li2,A 1 ∑ + u +e − ←7Li −2 ,X 2 ∑ + u . The electron affinity of7Li2 is determined to be 0.437±0.009 eV, leading to an anion dissociation energy,D 0, of 0.865±0.022 eV for the ground state of7Li −2 . A Franck-Condon analysis of the7Li2,X 1 ∑ + g +e − ←7Li −2 ,X 2 ∑ + u band yields the following spectroscopic constants for the ground state of7Li −2 :B e =0.502±0.005 cm−1,r e =3.094±0.015 Å, and ω e =232±35 cm−1.

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Authors and Affiliations

  1. Department of Chemistry, Johns Hopkins University, 21218, Baltimore, MD, USA

    H. W. Sarkas, S. T. Arnold, J. H. Hendricks, V. L. Slager & K. H. Bowen

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  1. H. W. Sarkas
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  2. S. T. Arnold
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  3. J. H. Hendricks
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  4. V. L. Slager
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  5. K. H. Bowen
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Sarkas, H.W., Arnold, S.T., Hendricks, J.H. et al. Characterization of theX 2 ∑ +u state of7Li −2 via negative ion photoelectron spectroscopy. Z Phys D - Atoms, Molecules and Clusters 29, 209–212 (1994). https://doi.org/10.1007/BF01437139

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  • DOI: https://doi.org/10.1007/BF01437139

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