Estimation of Column Calibration Factor and Force Parameters to Predict Temperature Dependence of Thermal Diffusion Factor of Some Simple Molecules

Abstract

The column calibration factor (CCF) F_s of a column (Roos and Rutherford 1969) has been accurately estimated to yield the thermal diffusion factor α _T's of Kr⁸⁰--Kr⁸⁶, Xe¹²⁹--Xe¹³⁶, CO²⁸--CO²⁹, CH₄¹⁶--CH₄¹⁷ and N₂²⁸--N₂²⁹ respectively at two different experimental temperatures. The probable temperature dependence of α _T's are used to obtain the force parameters ε _ij/k and σ _ij of the respective molecules. Again, the α _T's as obtained from lnq_max and F_s are compared with the experimental α _T's by the existing method involved with column shape factors as well as theoretical α _T's based on elastic and inelastic collisions among the molecules. The comparison of the estimated force parameters with the reported ones finally suggests the technique of predicting α _T's as a function of temperature is extremely useful.