Structure of Emitter Electrode for Enhancing Ion Currents

A structure of an emitter electrode for enhancing ion currents, comprising:

• a tip end part, formed at a front end of the structure of the emitter electrode, having a pinpoint, a first diameter, and a radius of curvature;
• and
• a shank part, formed in a rear of the tip end part at the front end of the structure of the emitter electrode;
• wherein a length of the tip end part with the shank part is from the pinpoint to a first position of the shank part, and a first distance between the first position and the pinpoint is 300 times of the first diameter;
• wherein the radius of curvature of the tip end part ranges from 50 nanometers to 5 micrometers;
• wherein the first diameter is 2 times of the radius of curvature.