Nitrogen <i>K</i>-Edge X-ray Absorption Spectra of Ammonium and Ammonia in Water Solution: Assessing the Performance of Polarizable Embedding Coupled Cluster Methods.

Already on the basis of these two structures, we noticed quite significant differences between the CC2 and CCSD predictions, especially for the protonated species, which we considered a preliminary indication that the CC2 method might not be sufficiently accurate.

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