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We report observation of new infrared bands of (CS2)2 and (CS2)3 in theregion of the CS2 {\nu}1+ {\nu}3 combination band (at 4.5 cm-1) using a quantumcascade laser. The complexes are formed in a pulsed supersonic slit-jetexpansion of a gas mixture of carbon disulfide in helium. We have previouslyshown that the most stable isomer of (CS2)2 is a cross-shaped structure withD2d symmetry and that for (CS2)3 is a barrel-shaped structure with D3 symmetry.The dimer has one doubly degenerate infrared-active band in the {\nu}1+ {\nu}3region of the CS2 monomer. This band is observed to have a rather smallvibrational shift of -0.846 cm-1. We expect one parallel and one perpendicularinfrared-active band for the trimer but observe two parallel and oneperpendicular bands. Much larger vibrational shifts of -8.953 cm-1 for theperpendicular band and -8.845 cm-1 and +16.681 cm-1 for the parallel bands areobserved. Vibrational shifts and possible vibrational assignments, in the caseof the parallel bands of the trimer, are discussed using group theoreticalarguments.

Infrared bands of CS2 dimer and trimer at 4.5 cm-1