Fig. 15.
The J = 1 → 0 line of the three isotopologues of HCN observed in the plasma of CH4+N2+CH3CN (26 min of observing time per W sub-band). This frequency domain of the spectrum is observed in the WL and WM sub-bands. Hence, the total observing time is 52 min. The observing procedure was FS with a throw of 37 MHz. The line width at half intensity is 0.62 MHz for a total pressure of 28 × 10−3 mbar. Frequencies are relative to the strongest hyperfine component.
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