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(A) OSX polymer with 20 μL of 1:1 (v/v) methanol:water spray solvent deposited on its surface and aligned in front of the inlet of the mass spectrometer without any applied spray voltage. (B) A spray mist from an OSX polymer with 20 μL of a 9:1 (v/v) methanol:water spray solvent on the polymer surface with an applied voltage of 5 kV.
