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

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  • Qc Physics


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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