[en] This reply offers further support for the assignments of the vibrational frequencies of C6 made in our original paper [C. C. Arnold, Y. Zhao, T. N. Kitsopoulos, and D. M. Neumark, J. Chem. Phys. 97, 6121 (1992)]. Two of our experimental frequencies are quite different from the corresponding ab initio values, and the resolution of this discrepancy clearly requires further theoretical work