Precision measurement of the rotational energy-level structure of the three-electron molecule He2+
Abstract
The term values of all rotational levels of the 4He2+\,X+\,2u+\,(+=0) ground vibronic state with rotational quantum number N+ 19 have been determined with an accuracy of 8 x 10-4 cm-1 (25 MHz) by MQDT-assisted Rydberg spectroscopy of metastable He2*. Comparison of these term values with term values recently calculated ab initio by Tung et al. [J. Chem. Phys. 136, 104309 (2012)] reveal discrepancies that rapidly increase with increasing rotational quantum number and reach values of 0.07 cm-1 (2.1 GHz) at N+=19.
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