The comparison with the high-resolution spectrum (Fig. ) reveals more details. Lines of the PFI-ZEKE experiment and our simulation match very well. Especially the states of A 1 symmetry are well aligned with the experimental features. States close to the origin are similar to the non-coupled states. The origin peak is of A 1 (0,0,0) character, the first two excitations in the symmetric bend, A 1 (0,1,0) and A 1 (0,2,0) are also very similar to the non-coupled states, whereas the higher excitations in this progression show significant mixing. The same progression with one vibrational quanta in the symmetric stretch is more interesting. The first of its peaks is very well aligned with experimentally visible feature, which was previously assigned as the origin of the second electronic state. The second peak in this series, A 1 (1,1,0), has very high similarity to its uncoupled version. It is a good candidate to assign the experimental, unassigned feature above 102,600 cm -1 .