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Carbonic acid (H2CO3) is a weak acid relevant to astrobiology which, to date,remains undetected in space. Experimental work has shown that thebeta-polymorph of H2CO3 forms under space relevant conditions through energetic(UV photon, electron, and cosmic ray) processing of CO2- and H2O-rich ices. Wepresent a systematic set of VUV photoabsorption spectra of pure and mixed CO2and H2O ices exposed to 1 keV electrons at 20 and 80 K to simulate differentinterstellar and Solar System environments. Ices were then annealed to obtain alayer of pure H2CO3 which was further exposed to 1 keV electrons at 20 and 80 Kto monitor its destruction pathway. Fourier-transform infrared (FT-IR)spectroscopy was used as a secondary probe providing complementary informationon the physicochemical changes within an ice. Our laboratory work shows thatthe formation of solid H2CO3, CO, and O3 upon the energetic processing ofCO2:H2O ice mixtures is temperature-dependent in the range between 20 and 80 K.The amorphous to crystalline phase transition of H2CO3 ice is investigated forthe first time in the VUV spectral range by annealing the ice at 200 and 225 K.We have detected two photoabsorption bands at 139 and 200 nm, and we assignedthem to beta-H2CO3 and gamma-H2CO3, respectively. We present VUV spectra of theelectron irradiation of annealed H2CO3 ice at different temperatures leading toits decomposition into CO2, H2O, and CO ice. Laboratory results are compared toCassini UltraViolet Imaging Spectrograph observations of the 70-90 K icesurface of Saturn's satellites Enceladus, Dione, and Rhea.

astronomy and astrophysics

Vacuum ultraviolet photoabsorption spectroscopy of space-related ices:  Formation and destruction of solid carbonic acid upon 1~keV electron  irradiation