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Interaction of methanol, acetone and formaldehyde with ice surfaces between 198 and 223 K

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons101366

Winkler,  A. K.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons101006

Holmes,  N. S.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons100898

Crowley,  J. N.
Atmospheric Chemistry, Max Planck Institute for Chemistry, Max Planck Society;

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Citation

Winkler, A. K., Holmes, N. S., & Crowley, J. N. (2002). Interaction of methanol, acetone and formaldehyde with ice surfaces between 198 and 223 K. Physical Chemistry Chemical Physics, 4(21), 5270-5275.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-91BC-B
Abstract
The rate and extent of physical adsorption of methanol, acetone and formaldehyde on ice were measured as a function of concentration and temperature. The gas ice interaction was analysed by applying adsorption isotherms to determine temperature dependent Langmuir constants, K(T) and saturation surface coverage, N-max. At low coverage a partitioning constant K-#(T) was derived. The dependence of K-# on temperature is given by K-#(T) = 6.24 x 10(-12) exp(6178/T) cm for methanol and K-#(T) = 1.25 x 10(-10) exp(5575/T) cm for acetone. For formaldehyde a temperature independent expression, K-# = 0.7 cm was derived. From these data adsorption enthalpies DeltaH(ads) of (-46 +/- 7) and (-51 +/- 10) kJ mol(-1) were obtained for acetone and methanol, respectively. The results were used to calculate the equilibrium partitioning of these trace gases to ice surfaces under conditions relevant to the atmosphere.