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Mass-selective, ionization-detected stimulated Raman spectroscopies have been applied to the study of benzene dimmer $isotopomers.1,2$ The results have been interpreted in terms of the dimmer geometry. The species is found to be characterized by inequivalent benzene sites. The evidence further indicates that one of the sites is of high and the other of low symmetry. All of the Raman results are consistent with a T-shaped geometry similar to the nearest neighbor geometry in benzene crystal. (Work Supported by the US Department of Energy, Office of Basic Energy Sciences. Grant no. DE-FG03-89-ER14066.)