Abstract
Doubly charged cluster ions, besides singly charged cluster ions, from sodium and potassium nitrates were produced evidently under normal source capillary temperature of 200 °C in both positive and negative ion electrospray ionization (ESI) ion trap mass spectrometry. The fragmentation pathways for doubly charged cluster ions were studied in detail using ESI tandem mass spectrometry and two pathways were observed depending on the cluster sizes of alkali metal nitrates. In addition, factors that affect the formation of cluster ions were also interrogated.
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