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- W1981508955 abstract "Doubly charged sodium chloride cluster ions [(NaCl)m(Na)2]2+ with m = 11–62, were produced by electrospray ionization and examined by tandem mass spectrometry in a quadrupole ion trap. Variations in the ion intensity with cluster size indicate the existence of magic numbers at m = 11, 12, 17, 20, 21, 26, 30, 34, 36, 44, 54, and 61. The magic number clusters were studied by collision-induced dissociation (CID). The largest clusters (m > 35) fragment mainly by neutral losses. Cluster ions containing 19–35 NaCl molecules are prone to fission with charge separation to form a singly charged magic number cluster ion (a regular crystallite comprised of a × b × c ions, where a, b, and c are small odd integers) along with other lower abundance singly charged clusters. Small doubly charged clusters (m < 19) could not be isolated for study by tandem mass spectrometry unless an unusually large isolation window (10–30 mass/charge units) was used. Structures of three types are proposed to account for the dissociation behavior of the magic number clusters: (1) combination blocks, where a block is a singly charged magic number cluster a × b × c, including the special case of a perfect sheet (a × b × 1), (2) merged blocks, and (3) regular crystallites with single-point defects (a × b × c − 1, where a, b, and c are small odd integers). Electrospray ionization (ESI) proves to be a good way to generate salt clusters in the gas phase and ion trap tandem mass spectrometry is well suited to their characterization." @default.
- W1981508955 created "2016-06-24" @default.
- W1981508955 creator A5036827887 @default.
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- W1981508955 date "2000-01-01" @default.
- W1981508955 modified "2023-09-29" @default.
- W1981508955 title "Doubly charged cluster ions [(NaCl)m(Na)2]2+: magic numbers, dissociation, and structure" @default.
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- W1981508955 doi "https://doi.org/10.1016/s1387-3806(99)00184-0" @default.
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