The $A^{1}Σ^{+}_{u}$ + (1)$^1Π_u$ system of Mg$_2$

Horst Knöckel; Steffen Rühmann; Eberhard Tiemann

doi:10.1140/epjd/e2014-50289-9

paper

The $A^{1} Σ_{u}^{+}$ + (1) $^{1} Π_{u}$ system of Mg $_{2}$

arXiv:1404.2180 · doi:10.1140/epjd/e2014-50289-9

Abstract

The $A^{1} Σ_{u}^{+}$ - $X^{1} Σ_{g}^{+}$ UV spectrum of Mg $_{2}$ 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 $A^{1} Σ_{u}^{+}$ for the range of vibrational levels 1 $\leq$ $v^{'}$ $\leq$ 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) $^{1} Π_{u}$ could be uniquely identified due to the overlapping spectral structures.

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The $A^{1} Σ_{u}^{+}$ + (1) $^{1} Π_{u}$ system of Mg $_{2}$

Abstract

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The A1Σu+​ + (1)1Πu​ system of Mg2​

Abstract

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The $A^{1} Σ_{u}^{+}$ + (1) $^{1} Π_{u}$ system of Mg $_{2}$