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 Kr 80 –Kr 86 , Xe 129 –Xe 136 , CO 28 –CO 29 , CH 4 16 –CH 4 17 and N 2 28 –N 2 29 respectively at two different experimental temperatures. The probable temperature dependence of α T 's are used to obtain the force parameters ε i j / k and σ i j 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.