MOLECULAR CLUSTERS FORMATION MODEL FOR MLIS

P. MACEIRA; E. CORTIZO; P. FAINSTEIN; J. FIOL; D. FREGENAL; J. FUHR; T. GUOZDEN; E. KAUL; P. KNOBLAUCH; G. ROZAS; M. ZARCO

San Carlos de Bariloche

Workshop; 13th Workshop on Separation Phenomena in Liquids and Gases SPLG 2015; 2015

A model of small molecular cluster formation is presented in this paper. The model is based mainly on a step by step growth mechanism by collisions between UF6 molecules, followed by stabilizing collisions with the carrier gas. The efficacy of the growth is calculated by a relationship between the number of such collisions, the probability of formation, the probability of stabilization and the probability of dissociation. The probability of dissociation is calculated by RRKM theory, which requires detailed inclusion of the energy transfer involved in each mechanism. Calculations allow to describe the evolution of cluster sizes through a supersonic expansion and obtain their distribution as a function of macroscopic parameters such as pressure and temperature.