Interaction of atomic and molecular hydrogen with tholin surfaces at low temperatures.
We study the interaction of atomic and molecular hydrogen with a surface of tholin, a man-made polymer considered to be an analogue of aerosol particles present in Titan's atmosphere, using thermal programmed desorption at low temperatures below 30 K. The results are fitted and analyzed using a fine-grained rate equation model that describes the diffusion, reaction, and desorption processes. We obtain the energy barriers for diffusion and desorption of atomic and molecular hydrogen. These barriers are found to be in the range of 30-60 meV, indicating that atom/molecule-surface interactions in this temperature range are dominated by weak adsorption forces. The implications of these results for the understanding of the atmospheric chemistry of Titan are discussed.
Li
Ling
L
Physics Department, Syracuse University, Syracuse, New York 13244, USA.
Zhao
Hui
H
Vidali
Gianfranco
G
Frank
Yechiel
Y
Lohmar
Ingo
I
Perets
Hagai B
HB
Biham
Ofer
O
D000336:Aerosols / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
D000336:Aerosols; D006859:Hydrogen