Precision measurement of the rotational energy-level structure of the three-electron molecule He2.


The term values of all rotational levels of the 4He2+ X+  2Σu+ (ν+=0) ground vibronic state with rotational quantum number N+ ≤ 19 have been determined with an accuracy of 8 × 10-4 cm-1 (∼25 MHz) by multichannel-quantum-defect-theory-assisted Rydberg spectroscopy of metastable He2∗. Comparison of these term values with term values recently calculated ab… (More)


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