Production, dissociation, and gas phase stability of sodium fluoride cluster ions studied using electrospray ionization ion trap mass spectrometry
Ince, M.P. Perera, B. Asiri Van Stipdonk, Michael J.
Ince, M.P.
Perera, B. Asiri
Van Stipdonk, Michael J.
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2001-04-12
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Cluster ions,Collision-induced dissociation,Electrospray ionization,Gas phase stability,Sodium fluoride
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M.P Ince, B.A Perera, M.J Van Stipdonk, Production, dissociation, and gas phase stability of sodium fluoride cluster ions studied using electrospray ionization ion trap mass spectrometry, International Journal of Mass Spectrometry, Volume 207, Issues 1–2, 2001, Pages 41-55, ISSN 1387-3806, https://doi.org/10.1016/S1387-3806(00)00454-1.
Abstract
A Finnigan LCQ-Deca™ was used to produce and characterize ions derived from solutions of sodium fluoride. As with sputtering experiments involving the same salt, electrospray produces an extensive series of positively charged cluster ions based on repeating units of NaF with a pendant Na cation. In addition, a series of doubly charged ions corresponding to multiple (NaF) units modified by the addition of two Na cations was observed. We found that the general peak intensity distribution in the mass spectrum of NaF was sensitive to the temperature of the heated capillary used in the LCQ to desolvate ions after formation by electrospray ionization. At temperatures greater than 200 °C the doubly charged ion signal disappears. At temperatures above 275 °C, a distribution of singly charged cluster ions is produced that is similar to those observed in sputtering experiments conducted using sector or quadrupole based mass spectrometers, including the increased intensities at well-known "magic numbers" that reflect the stability of structures reminiscent of the solid-state structure of NaF. As in earlier investigations, our tandem mass spectromery experiments show that the preferred dissociation channel is the loss of one or several (NaF) units and that the fragment ion intensities are influenced by the tendency to produce product ions with magic number compositions. The doubly charged cluster ions "fission" to produce singly charged fragment ions in a process analogous to that shown for sodium chloride cluster ions by Zhang and Cooks [Int. J. Mass Spectrom. 195/196 (2000) 667]. We found that the ion trap mass spectrometer is capable of performing dissociation experiments up to and including MS8 for most cluster ions with m/z values greater than 401. In addition, collision-induced dissociation profiles provide information about the relative stability of inorganic cluster ions in the gas phase. For instance, we show for several cluster ions that the dissociation profiles and, in particular, the shift in activation amplitude required for dissociation, are consistent with expected differences in stability due to the adoption of magic number conformations. © 2001 Elsevier Science B.V.
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Elsevier
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International Journal of Mass Spectrometry
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1387-3806