Part 4/6:
A unique aspect of his setup is the helium gas tank, which boasts a purity of 99.95%. The low oxygen content significantly enhances the quality of the experiments. He described his process for flushing previously used gases from the cell by utilizing the vacuum pump, which is not a high-rate model but is effective due to its oil-free operation.
This “flushing” process involves creating a vacuum, injecting the new gas, increasing internal pressure, and then pulling down the gas mix into the vacuum system. This ensures that residual gases from previous runs do not interfere with current experiments, particularly when testing with hydrogen mixtures.