| 摘要 |
PURPOSE:To enable the amount of an ionization metal contained in a porous heater to be controlled and reduce the amount of the ionization metal evaporated around an ion source by preparing it from an ion emitter and the porous heater. CONSTITUTION:An ionization metal is contained in a hair-pin-like or coil-like porous heater 2' to which an ion emitter 1 with a pointed end is attached. Owing to the above structure, the amount of the ionization metal contained in the porous heater 2' can be varied by controlling the porosity of the heater 2'. Furthermore, because the ionization metal is not exposed, the amount of the ionization metal evaporated around the ion source can be reduced. |
