Structure and dynamics of ice Ih films upon HCl adsorption between 190 and 270 K. I. Neutron diffraction and quasielastic neutron scattering experiments

Demirdjian, B.; Ferry, D.; Suzanne, J.; Toubin, C.; Picaud, S.; Hoang, P. N. M.; Girardet, C.
March 2002
Journal of Chemical Physics;3/22/2002, Vol. 116 Issue 12, p5143
Academic Journal
Neutron diffraction and quasielastic neutron experiments are performed to investigate the effect of HC1 adsorption on the structure and dynamics of an ultra-thin ice Ih film (5 H[sub 2]O bilayers thick) deposited on a crystalline MgO(001) substrate. Three HC1 coverages have been studied 0.3, 0.6, and 1 monolayer (ML) in the temperature range 190-270 K. At 0.3 and 0.6 HC1 monolayer, no mobility is measured at T≥220 K. A translational mobility, which is a signature of a liquid phase, is observed at T= 250 K. This phase occurs 15 K below the surface melting temperature of the bare ice film. The fraction of mobile molecules represents 30% (0.3 ML HC1) and 45% (0.6 ML HC1) of the film. At 1 HC1 monolayer and T= 220 K, HCl-dihydrate coexists with ice Ih, whereas at T= 250 K the ice film becomes amorphous and only 9% of the film is mobile. The results are discussed within the context of atmospheric chemistry.


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