Abstract
Multiply-charged noncovalent cluster anions of adenosine-5′-monophosphate (AMP) were formed by electrospray ionization (ESI). Ions in higher charge states were observed when the ions were accumulated in an ion trap with helium buffer gas before detection. We determined the smallest size (n a) or appearance size as a function of charge state (q), i.e., n a=4 for q= 2, n a=8 for q=3, and n a=13 for q=4. The relation between n a and q can be described by a charged droplet model. When the size is larger than n a for a given q, the fragmentation pathway of an anion cluster is dominated by loss of neutral fragments. In contrast, when the size approaches the appearance size, only charged fragments are formed.
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Published online September 26, 2005
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Liu, B., Hvelplund, P. & Nielsen, S.B. Multiply-charged negative clusters of adenosine-5′-monophosphate in the gas phase. J Am Soc Mass Spectrom 16, 1840–1845 (2005). https://doi.org/10.1016/j.jasms.2005.07.021
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DOI: https://doi.org/10.1016/j.jasms.2005.07.021