Spray ionization device, analysis device, and surface coating device

A spray ionization device, comprising:

• a first tube including a first channel through which a liquid can flow, the first tube including a first outlet for ejecting the liquid at one end;
• a second tube surrounding the first tube with a gap and including a second channel through which a gas can flow, the second tube including a second outlet at the one end, the second channel being defined by an outer circumferential surface of the first tube and an inner circumferential surface of the second tube;
• and
• an electrode that can contact the liquid flowing through the first channel, the electrode being provided only at a supply end of the first tube such that a distal end of the electrode projects into the first channel from an inner circumferential surface of the first tube and/or forms a surface contiguous with the inner circumferential surface of the first tube, and capable of applying voltage to the liquid by way of a power source connected to the electrode, wherein
• at the one end, the second outlet is arranged further toward a tip than the first outlet, at least a portion of the inner circumferential surface of the second tube has a diameter that progressively decreases toward the second outlet, and a diameter of the inner circumferential surface of the second outlet is equal to or greater than an opening diameter of the first outlet, and
• electrically charged droplets of the liquid can be ejected from the second outlet.