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Ionization method whereby an electrolyte solution of sodium iodide, ammonium acetate, or other ma-terial dissolved in glycerin is sprayed from the end of a metallic capillary tube with a high electric field (~10kV) applied. Spray ionization then occurs while tearing off ions by an opposing electrode. The sodium ions and multiprotonated glycerin cluster ions thus generated can be used as impact particles for MCI. When sample is dissolved in the solution ions such as [M + H]⁺ and [M + Na]⁺ are generated.