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The VUV absorption cross sections of most molecular solids present ininterstellar ice mantles with the exception of H2O, NH3, and CO2 have not beenreported yet. Models of ice photoprocessing depend on the VUV absorption crosssection of the ice to estimate the penetration depth and radiation dose, and inthe past, gas phase cross section values were used as an approximation. We aimto estimate the VUV absorption cross section of molecular ice components. Pureices composed of CO, H2O, CH3OH, NH3, or H2S were deposited at 8 K. The columndensity of the ice samples was measured in situ by infrared spectroscopy intransmittance. VUV spectra of the ice samples were collected in the 120-160 nm(10.33-7.74 eV) range using a commercial microwave-discharged hydrogen flowlamp. We provide VUV absorption cross sections of the reported molecular ices.Our results agree with those previously reported for H2O and NH3 ices.Vacuum-UV absorption cross section of CH3OH, CO, and H2S in solid phase arereported for the first time. H2S presents the highest absorption in the 120-160nm range. Our method allows fast and readily available VUV spectroscopy of iceswithout the need to use a synchrotron beamline. We found that the iceabsorption cross sections can be very different from the gas-phase values, andtherefore, our data will significantly improve models that simulate the VUVphotoprocessing and photodesorption of ice mantles. Photodesorption rates ofpure ices, expressed in molecules per absorbed photon, can be derived from ourdata.

Vacuum-UV spectroscopy of interstellar ice analogs. I. Absorption cross-sections of polar-ice molecules