Rovibrational computations for the He2 a 3u+ state including non-adiabatic, relativistic, and QED corrections
Abstract
A potential energy curve (PEC) accurate to a fraction of 1 ppm (1:106) is computed for the 3u+ state of He2 endowed with relativistic and QED corrections. The nuclear Schr\"odinger equation is solved on this PEC with diagonal Born-Oppenheimer and non-adiabatic mass corrections to obtain highly accurate rotational-vibrational levels. The computed rovibrational intervals and fine-structure splittings, spanning over several orders of magnitude in energy, are found to be in remarkable agreement with available high-resolution spectroscopy data.
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