The effect of counter ions in matrix-assisted laser desorption/ionization of poly(methyl methacrylate)

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Abstract
The role of the counter anion in positive-ion matrix-assisted laser desorption/ionization (MALDI) mass spectrometry of poly(methyl methacrylate) (PMMA) has been investigated. When PMMA was analyzed by MALDI in the presence of different alkali metal halides, A+X−, ion yields decreased on changing X− from I− to Br− to Cl−. The effects of changing the alkali metal cation A+ were greater when X− was chloride than when X− was iodide. With a mixture of two different alkali metal cations, PMMA showed different affinities for the cations, dependent upon which counter anion was present.

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