He-Ar混合気体分子線における加速効果と質量分離作用

概要

論文の詳細を見る
The effects of seeding and mass-separation in molecular-beams of He-Ar mixtures are experimentally studied in order to quantitatively handle composition distortions which inevitably occur during the molecular-beam mass-spectrometer sampling process. The experiment, with the aid of the time of flight mass-spectrometer, is carried out in the range of the source conditions of the argon molal fraction χ_o=0〜100% and the mixture total pressure p_o=25〜75 Torr under constant room temperature. The hydrodynamic velocity of heavier argon molecules remarkably increases approaching that of lighter helium ones, especially for χ_o<lsim>1%, and the translational kinetic energy enhancement reaches isentropically 10, i.e., the molecular weight ratio. The Mach number of Ar, however slightly reduces. The mass-separation effect is also prominent, especially for χ_o<lsim>1%, and the total species enrichment factor attains the molecular weight ratio. The effect is essentially due to the Mach number focusing, which is also confirmed from the spatial spread behavior of helium and argon beams.
一般社団法人日本機械学会の論文
1987-12-25