Carbon dioxide interactions with crystalline and amorphous ice surfaces

Andersson, Patrik U,1970Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry (author)

Carbon dioxide interactions with crystalline and amorphous water ice have been studied by time-resolved molecular beam techniques. CO2 collisions at thermal kinetic energies with ice in the temperature range 100-160 K result in efficient trapping on the ice surface followed by desorption. The desorption kinetics on crystalline ice at 100-125 K are well described by the Arrhenius equation with an activation energy of 0.22 +/- 0.02 eV and a preexponential factor of 10(13.32+/-0.57) s(-1). Below 120 K, CO2 populates strongly bonded sites on amorphous ice, resulting in surface residence times on the order of minutes at 100 K, and the desorption data can in this case not be explained by a simple first-order process. The results are compared to previous studies of gas-ice interactions, and the implications for heterogeneous processes in the terrestrial atmosphere are discussed.

Någård, Mats BGothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry (author)
Witt, Georg (author)
Pettersson, Jan B. C.,1962Gothenburg University,Göteborgs universitet,Institutionen för kemi,Department of Chemistry(Swepub:gu)xpettj (author)
Göteborgs universitetInstitutionen för kemi (creator_code:org_t)

In:Journal of Physical Chemistry A: American Chemical Society (ACS)108:21, s. 4627-46311089-56391520-5215

By the author/editor: Andersson, Patri ...; Någård, Mats B; Witt, Georg; Pettersson, Jan ...

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NATURAL SCIENCES: NATURAL SCIENCES; and Chemical Science ...; and Physical Chemist ...

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