Infrared spectra of C2H4 dimer and trimer

Spectra of ethylene dimers and trimers are studied in the \u3bd11 and (for the dimer) \u3bd9 fundamental band regions of C2H4 ( 482990 and 3100\u202fcm 121) using a tunable optical parametric oscillator source to probe a pulsed supersonic slit jet expansion. The deuterated trimer has been observed previously, but this represents the first rotationally resolved spectrum of (C2H4)3. The results support the previously determined cross-shaped (D2d) dimer and barrel-shaped (C3h or C3) trimer structures. However, the dimer spectrum in the \u3bd9 fundamental region of C2H4 is apparently very perturbed and a previous rotational analysis is not well verified.Peer reviewed: YesNRC publication: Ye