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Structure Data of Free Polyatomic Molecules 530 MW C 4 H 6 F2 1,1-Difluorocyclobutane C2v (effective symmetry class) F F A double-minimum ring puckering potential function with a barrier to ring –1 inversion of 231(4) cm has been obtained from the analysis of the vibrational dependence of the rotational constants and inversion splittings ΔE01 and ΔE23. Lesarri, A., López, J.C., Alonso, J.L., Wlodarczak, G., Demaison, J.: J. Chem. Phys. 111 (1999) 6375. Landolt-Börnstein New Series II/28C