A common observation when using ionization gauges is that during high vacuum operation when the ion gauge is turned on, the pressure drops faster with the ion gauge on than when it is off. What is a possible explanation for this? it ionizes gas particles and removes them from the gas phase in the chamber ions that form from the gas particles increases the gas volume density ion gauges increases the temperature of gas particles leading to faster pumping ion gauges convert gas particles into charged ions which gives a false pressure reading