Abstract
For precise measurements of noble gases with a mass spectrometer, we need to separate each noble gas by adsorptive phenomena at low temperatures. We made adsorptive experiments for Ar, Kr, and Xe using a cold trap containing a sintered stainless steel filter element. In this paper, we applied a simple model to our experimental observations in order to better understand the adsorptive phenomena on the adsorbent, and obtained the conditions for more efficient separation of individual noble gas. The results suggest that the adsorption curves shift to a higher temperature when we release gas in a smaller volume of the extraction line. This temperature shift is larger for a noble gas with a higher mass. Therefore, small volume of preparation line is suitable for the clear separation of noble gases. It is also shown that the adsorption curve depends on the pressure of gases when the total number of gas atoms in the line is not negligible compared to the maximum number of atoms being adsorbed.
