Stick spectra of the four symmetric isotopologues in their to energy range. The intensities are normalized to an average value of 1. A log scale is used for the intensities because they range over nearly to three orders of magnitude. The limit of detection (or detection threshold) of each isotopologue is represented.
Histograms of the intensities in a standard log-log plot (Ref. 44). The widths of the bins are in a progression of . The continuous curve is the Porter-Thomas distribution (Ref. 44) (see text). For each isotopologue, we give the number of observed transitions and the number of transitions expected if the Porter-Thomas distribution remains valid for the (missing) weak transitions (see Table II).
The next neighbor distribution (NND) for the four symmetric isotopologues. The smooth curve is a modified version of the Wigner distribution which apply for the random superposition of two subsets of weight and , which correspond to and and which obey individually to the Wigner distribution (see text). The standard deviation is expected to be 0.68 instead of 0.53 for a single set of level obeying a Wigner distribution. The experimental resolution, which corresponds to 0.07 average spacing for (646), is represented by a vertical dashed line in the first bin.
and rovibronic symmetries for isotopologues of and symmetries. The levels observed by LIF are in bold. The missing levels are in brackets. This table does not include the contributions of the and electronic states which are assumed to be negligible. This is why the two columns corresponding to and are missing for the symmetry. For the symmetry, the column would have been omitted because all the rovibronic levels belong to electronic states which are the counterpart of the and electronic states observed for the (646) isotopologue.
Summary of the lines counting for the six isotopologues (see text).
Comparison of the sum of and rovibronic densities for six isotopologues of near .
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