Column Calibration Factor: Temperature Dependence of Isotopic α_T

Abstract

The variation of the column calibration factor F_s due to temperature change has been used to estimate the temperature dependence of thermal diffusion factors α_T of isotopic gas mixtures with their natural isotopic abundances: ²⁰Ne–²²Ne, ³⁶Ar–⁴⁰Ar, ⁸⁰Kr–⁸⁶Kr and ¹²⁸Xe–¹³⁶Xe. Unlike method based on the column theory using molecular models of binary interactions, the values of α_T thus obtained agree with theoretical ones, implicating that the column calibration factor is an important parameter in column measurements to calculate α_T.