抄録
A new mixed gas inlet system for a Knudsen cell was developed for the introduction of a H2-O2 mixture and other mixed gases into a Knudsen cell of a high temperature mass spectrometer from outside reservoirs. Pressure of the gases as introduced into the Knudsen cell is controlled by the gas flow rates through low conductance capillary tubes connected to the outside reservoirs. The experimentally obtained gas flow rates agreed fairly well with the calculated ones for room temperature. However, the measured temperature dependence of the gas pressure in the Knudsen cell showed a negative departure from that of the theoretical values, which became especially large above about 1400 K. It was confirmed that, compared to the case of using the conventional direct H2O introduction method, water vapor can be supplied much promptly into a Knudsen cell in mass spectrometer from the outside by introducing H2 and O2 gases separately through the mixed gas inlet system developed in this study.
