Ionization emitter, ionization apparatus, and method for manufacturing ionization emitter

An ionization emitter comprising:

• a tip;
• and
• a channel for supplying a solution sample into the tip from the base end side of the tip,
• wherein the channel is formed by filling a pipe line with a packing, and the tip constitutes a columnar or conical porous self-standing structure projecting from the pipe line of the channel to expose a distal end surface and a lateral surface thereof, the packing and the porous self-standing structure constituting the tip having been simultaneously and integrally formed as a single structure and composed of a same porous body, and
• wherein a high voltage is applied between the tip and an electrode provided so as to be opposed to the distal end side of the tip to generate electrospray to ionize molecules contained in the solution sample supplied into the tip.