Spectroscopy and electronic structure of jet-cooled Al2

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Abstract
Resonant two‐photon ionization spectroscopy has been used to study the jet‐cooled Al2 molecule. The ground state has been conclusively demonstrated to be of 3Πu symmetry, deriving from the σ1gπ1u electronic configuration. High resolution studies have established the bond length of the X3Πu state as re(X3Πu) =2.701±0.002 Å. The third‐law estimate of the Al2 bond strength has been reevaluated using the observed and calculated properties of the low‐lying electronic states to give D00 (Al2)=1.34±0.06 eV. In addition to the previously reported E 2 3Σ−g←X3Πu and F 33Σ−g←X3Πu band systems, the E’ 33Πg←X 3Πu, F‘–X, F’–X, G 3Πg←X 3Πu, H’ 3Σ−g←X 3Πu, and H3Δg←X3Πu band systems have been observed for the first time. Bands of the G–X, H’–X, and H–X systems have been rotationally resolved and analyzed, providing rotational constants and electronic state symmetries for the upper states of these systems. A discussion of all of the experimentally known states of Al2 is presented, along with comparisons to previous experimental and theoretical work.

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