Fig. 4.
Comparison between the 65.9–66.2 GHz spectra recorded using Ar (upper black red) and He (lower black trace) as carrier gas. In both spectra the aG′Ag-12BD K a = 6←5 Q-branch transitions can be recognized, whereas the same transitions of less stable g′G′Ag-12BD are completely depleted in the Ar spectrum. Numbers above the peaks indicate the assigned J quantum numbers.
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