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(a)Schematics of an endoscopic sampling ionization probe which composed of a coaxial capillary sprayer and a transfer tube. A probe with a 4m long, 1/16″ i.d. tubing was used for the analysis of the rat brain tissue section, with the spectra recorded for (b) the white matter and (c) the grey matter. Gas flow rate of 4.3 L/min, high voltage at −4.5kV, methanol/water 1:1 as spray solvent
