Electron ionization methods in gases are mainly based on the process of ionization. Various methods of ionization can be applied. For example, the ionization of gas molecules is created using an electric field, which produces the current. Additionally, the interaction of electron projectiles or photons with the gas can lead to ionization. It is also possible to ionize gases through radioactive radiation or ultraviolet light. The nature, pressure, and temperature of the gas depend on the strength of the current produced in each method. The degree of ionization increases with increased ionization intensity of the electric current. These methods are used in technical and scientific processes