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Rotationally resolved vibrational spectra of the three lowest frequency bands of the four-membered heterocycle azetidine (c-C 3 H 6 NH) have been collected with a resolution of 0.00096cm −1 using the far infrared beamline at the Canadian Light Source synchrotron. The modes observed correspond principally to motions best described as: β-CH 2 rock (ν 14 ) at 736...