Fig. 2.
FTMW spectra of HC3O+ showing the 2–1 and 3–2 rotational transitions at 17 842.3387 and 26 763.4695 MHz, respectively. The spectra were achieved via 20 000 shots of accumulation at a repetition rate of 10 Hz. The coaxial arrangement of the adiabatic expansion and the resonator axis produces an instrumental Doppler doubling. The resonance frequencies are calculated as the average of the two Doppler components.
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