Fig. 2
Comparison of spectral intensity of hydantoin in its vibrational ground state (left) and two excited states (center and right) at 150°C, observed at 121 GHz (NKaKc = 350 35 ← 341 34, NKaKc = 351 35 ← 340 34). Each spectrum was recorded by integrating 400 scans with a 0.5 Hz repetition rate and a 1 ms time constant of the lock-in amplifier.
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