Mars - Photodesorption from mineral surfaces and its effects on atmospheric stability

Details Mars - Photodesorption from mineral surfaces and its effects on atmospheric stability Mars - Photodesorption from mineral surfaces and its effects on atmospheric stability

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977icar...32..270h&link_type=abstract

Icarus, vol. 32, Nov. 1977, p. 270-298.

Computer Science

3

Adsorption, Atmospheric Chemistry, Desorption, Kinetic Theory, Mars Atmosphere, Photochemical Reactions, Carbon Dioxide, Carbon Monoxide, Catalysis, Chemisorption, Ligands, Photodissociation

Scientific paper

Kinetic constraints are employed to identify the reactive chemisorbed complexes, to describe the mechanism of UV-accelerated desorption from Fe (+2) on mineral surfaces, and to estimate the photodesorption rate on Mars. In particular, it is proposed that gases such as O2, CO2, CO, H2O and N2 undergo an adsorption-desorption process at octahedrally coordinated Fe (+2) surface sites to produce seven-coordinate transition-state complexes. The ligand field stabilization energy acquired by these complexes lies between 16 and 18 kcal per mole. Published photocatalysis data are used to assess the role of photodesorption in Martian atmospheric chemistry and stability.

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