  The infrared spectrum of the weakly-bound CO2-Xe complex is studied in the
region of the carbon dioxide nu3 fundamental vibration (~2350 cm-1), using a
tunable OPO laser source to probe a pulsed supersonic slit jet expansion. The
Xe isotope dependence of the spectrum is modeled by scaling the vibrational and
rotational parameters, with the help of previous microwave data. The scaling
model provides a good simulation of the observed broadening and (partial)
splitting of transitions in the fundamental band, and it is essential for
understanding the intermolecular bending combination band where some
transitions are completely split by isotope effects. The combination band is
influenced by a significant bend-stretch Coriolis interaction and by the
relatively large Xe isotope dependence of the intermolecular stretch frequency.
The weak CO2-Xe spectrum corresponding to the (0111) <-- (0110) hot band of CO2
is also detected and analyzed, providing a measurement of the symmetry breaking
of the CO2 bending mode induced by the nearby Xe atom. This in-plane /
out-of-plane splitting is determined to be 2.14 cm-1.
