Surface science investigations of the role of CO 2 in astrophysical ices

We have recorded reflection–absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD) data for a range of CO2 -bearing model astrophysical ices adsorbed on a graphitic dust grain analogue surface. Data have been recorded for pure CO2 , for CO2 adsorbed on top of amorphous solid water, for mixed CO2 :H2 O ices and for CO2 adsorbed on top of a mixed CH3 OH:H2 O ice. For the TPD data, kinetic parameters for desorption have been determined, and the trapping behaviour of the CO2 in the H2 O (CH3 OH) ice has been determined. Data of these types are important as they can be used to model desorption in a range of astrophysical environments. RAIR spectra have also shown the interaction of the CO2 with H2 O and CH3 OH and can be used to compare with astronomical observations, allowing the accurate assignment of spectra.