15min:

ZIQIU CHEN AND JENNIFER VAN WIJNGAARDEN, Department of Chemistry, University of Manitoba, Winnipeg MB R3T 2N2 Canada.

Rotationally resolved vibrational spectra of the four lowest frequency bands of the four-membered heterocycle 3-oxetanone (c-C₃H₄O₂) have been collected with a resolution of 0.00096 cm^-1 using the far infrared beamline at the Canadian Light Source synchrotron. The modes observed correspond to motions best described as: ring puckering v₂₁ at 139.55 cm^-1, C=O deformation (out-of-plane) v₂₀ at 399.59 cm^-1, C=O deformation (in-plane) v₁₆ at 448.19 cm^-1, and the ring deformation v₇ at 684.99 cm^-1. The observed spectra exhibit rich spectroscopic features including hot bands originating from the low energy ring puckering band and a first order a-type Coriolis interaction between the closely spaced v₁₆ and v₂₀ bands. The assignment and analysis of these dense spectra will be presented.