  Infrared spectra of Rg1,2 - C6H6 complexes (Rg = He, Ne, Ar) are observed in
the region of the nu12 fundamental of C6H6 using a pulsed supersonic jet
expansion and a tunable optical parametric oscillator laser source. The mixed
trimer He - Ne - C6H6 is also detected. Four bands are analyzed for each
complex, namely nu12 itself (~3048 cm-1) and three linked combination bands
(~3079, 3100, and 3102 cm-1). The results are consistent with previous
ultraviolet and microwave results, with Ne2 - C6H6 and He - Ne - C6H6 being
analyzed spectroscopically here for the first time.
