Realization of the Triple Points of Equilibrium Hydrogen by an Open Cell Method Using a GM Closed -Cycle Refrigerator

摘要

The triple point of equilibrium hydrogen is realized by an open cell method using a closed-cycle helium refrigerator. Abnormality is observed on the heat capacity curves of solid hydrogen at temperatures of about 0.1 K below the triple point of equilibrium hydrogen in the case of usage of 2 g of activated ferric hydroxide as a catalyst for the ortho-and para-hydrogen's equilibration.