Evaporation Mechanism and Vapor Composition

A number of substances are known to evaporate simultaneously into monomers, dimers, and higher polymeric species in the gas phase. For many of these systems the evaporation is expected to be limited by a surface reaction which precedes desorption. A method is given for determining from experiments whether the various species are evaporated independently. The experiments which will define the evaporation mechanism measure the variation of the evaporation rates with the size of the orifice of the evaporation chamber.