Observed and fitted spectra of hydantoin (solid and dashed lines, respectively) at 93 GHz (NKaKc = 270 27 ← 261 26,NKaKc = 271 27 ← 260 26,). The spectrum was recorded by integrating 400 scans at a 0.5 Hz repetition rate and a 1 ms time constant of the lock-in amplifier.
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