Abstract
Ground-state rotational spectra of six symmetric-top isotopomers, C 6H 6 ⋯ H 79 Br, C 6H 6 ⋯ H 81 Br, C 6D 6 ⋯ H 79 Br, C 6D 6 ⋯ H 81Br, C 6H 6 ⋯ D 79Br and C 6H 6 ⋯ D 81Br, of the benzene-hydrogen bromide complex were observed and analysed to give the rotational constant B 0, the centrifugal distortion constants D J and D JK , and the Br nuclear quadrupole and spin-rotation coupling constants X aa and M bb in each case. It is concluded that in the zero-point state the complex has effective C 6v symmetry, with HBr oriented so that H lies closest to the benzene ring and undergoes a circular motion which allows it to sample the π-electron density of the ring.
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