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The A 1Σ +u system of Mg2

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Abstract

The A 1 Σ +u -X 1 Σ +g UV spectrum of Mg2 has been investigated with high resolution employing Fourier-transform spectroscopy and laser excitation. Computer simulation and fit of line positions to the overlapping structures in the spectra yield precise transition frequencies. Starting with the well characterized ground state X 1 Σ + g from former work, we derived excited energy levels and report on the evaluation of the A 1 Σ +u excited state, which is found to interact with another electronic state, which we identify as the lower part of the (1)1 Π u state. A coupled channels fit to the level energies of the upper state yields a reliable potential energy curve for the A 1 Σ +u state for the range of vibrational levels 1 ≤ v′ ≤ 46. A potential energy curve for the (1)1 Π u state is proposed, but the (1)1 Π u state is only characterized by its coupling to the A state, and no direct transition to a level of the (1)1 Π u state could be uniquely identified due to the overlapping spectral structures.

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Authors and Affiliations

  1. QUEST and Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167, Hannover, Germany

    Horst Knöckel, Steffen Rühmann & Eberhard Tiemann

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  1. Horst Knöckel
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  2. Steffen Rühmann
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  3. Eberhard Tiemann
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Correspondence to Horst Knöckel.

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Knöckel, H., Rühmann, S. & Tiemann, E. The A 1Σ +u system of Mg2 . Eur. Phys. J. D 68, 293 (2014). https://doi.org/10.1140/epjd/e2014-50289-9

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  • DOI: https://doi.org/10.1140/epjd/e2014-50289-9

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