Infrared bands of CS dimer and trimer at 4.5 μm.

We report observation of new infrared bands of (CS) and (CS) in the region of the CS ν + ν combination band (at 4.5 µm) using a quantum cascade laser. The complexes are formed in a pulsed supersonic slit-jet expansion of a gas mixture of carbon disulfide in helium. We have previously shown that the most stable isomer of (CS) is a cross-shaped structure with D symmetry and that for (CS) is a barrel-shaped structure with D symmetry. The dimer has one doubly degenerate infrared-active band in the ν + ν region of the CS monomer. This band is observed to have a rather small vibrational shift of -0.844 cm. We expect one parallel and one perpendicular infrared-active band for the trimer but observe two parallel bands and one perpendicular band. Much larger vibrational shifts of -8.953 cm for the perpendicular band and -8.845 cm and +16.681 cm for the parallel bands are observed. Vibrational shifts and possible vibrational assignments, in the case of the parallel bands of the trimer, are discussed using group theoretical arguments.