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

被引：83

作者：

Winkler, AK ^{[1
]}

Holmes, NS ^{[1
]}

Crowley, JN ^{[1
]}

机构：

[1] Max Planck Inst Chem, Div Atmospher Chem, Mainz, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2002年 / 4卷 / 21期

关键词：

D O I：

10.1039/b206258e

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：5270 / 5275

页数：6

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