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We report that the cesium salts of monobutyl phthalate, heptafluorobutyric acid, tridecafluoroheptanoic acid, and perfluorosebacic acid generate salt/cluster ions that provide calibration peaks for electrospray mass spectrometers. In the case of the cesium salt of tridecafluoroheptanoic acid ions are available up to m / z 10,000.
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König et al. (1999) studied this question.
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