Abstract
A quadrupole mass spectrometer was connected to a shock tube. An ion source for fast reactions was designed. The characteristics of the ion source were examined in various conditions. The rise time was mainly dependent on the ion repeller voltage, the electron current, and the position and structure of the ion source. The lag time was also dependent on the ion repeller voltage and the position of the ion source. It was found that the rise time and the lag time depended on the behavior of both ions and neutral molecules in the vacuum chamber.
