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Infrared spectra of the CO2-N2 dimer are observed in the carbon dioxide nu3asymmetric stretch region (~2350 cm-1) using a tunable infrared opticalparametric oscillator to probe a pulsed slit jet supersonic expansion. Previousresults for the b-type fundamental band are extended to higher values of Ka. Ana-type combination band involving the lowest in-plane intermolecular bendingmode is observed. This yields a value of 21.4 cm-1, and represents the firstexperimental determination of an intermolecular mode for CO2-N2. Thisintermolecular frequency is at odds with the value of 45.9 cm-1 obtained from arecent 4D intermolecular potential energy surface. In addition, two weak bandsnear 2337 cm-1 are assigned to the CO2 hot band transition (v1, v2, l2, v3) =(0111) <-- (0110). They yield a value of 2.307 cm-1 for the splitting of thedegenerate CO2 nu2 bend into in-plane and out-of-plane components due to thepresence of the nearby N2. The in-plane mode lies at lower energy relative tothe out-of-plane mode.

journal of chemical physics online/the journal of chemical physics/journal of chemical physics

Spectra of CO2-N2 dimer in the 4.2 micron region: symmetry breaking of  the intramolecular CO2 bend, the intermolecular bend and higher K-values for  the fundamental