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Titolo:
Electrospray ionization tandem mass spectrometric study of salt cluster ions. Part 1 - Investigations of alkali metal chloride and sodium salt cluster ions
Autore:
Hao, CY; March, RE; Croley, TR; Smith, JC; Rafferty, SP;
Indirizzi:
Trent Univ, Dept Chem, Peterborough, ON K9J 7B8, Canada Trent Univ Peterborough ON Canada K9J 7B8 eterborough, ON K9J 7B8, Canada
Titolo Testata:
JOURNAL OF MASS SPECTROMETRY
fascicolo: 1, volume: 36, anno: 2001,
pagine: 79 - 96
SICI:
1076-5174(200101)36:1<79:EITMSS>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHARGED CLUSTERS; GAS-PHASE; EVAPORATION; SPRAY;
Keywords:
electrospray ionization; collision-induced dissociation; salt cluster; singly charged ion; multiply charged ion;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Physical, Chemical & Earth Sciences
Citazioni:
31
Recensione:
Indirizzi per estratti:
Indirizzo: March, RE Trent Univ, Dept Chem, Peterborough, ON K9J 7B8, Canada Trent Univ Peterborough ON Canada K9J 7B8 h, ON K9J 7B8, Canada
Citazione:
C.Y. Hao et al., "Electrospray ionization tandem mass spectrometric study of salt cluster ions. Part 1 - Investigations of alkali metal chloride and sodium salt cluster ions", J MASS SPEC, 36(1), 2001, pp. 79-96

Abstract

Salt cluster ions of alkali metal chlorides ACl (A = Li+, Na+, K+, Rb+ andCs+) and sodium salts NaB (B = I-, HCOO-, CH3COO-, NO2-, and NO3-), formedby electrospray ionization, were studied systematically by mass spectrometry. The influences on the total positive ion and negative ion currents of variation of solvent, solution concentration, desolvation temperature, solution flow-rate, capillary voltage and cone voltage were investigated. Only cone voltage was found to influence dramatically the distribution of salt cluster ions in the mass spectra observed. Under conditions of normal cone voltage of similar to 70 V, cluster ions having magic numbers of molecules are detected with high relative signal intensity. Under conditions of low cone voltage of similar to 10 V, the distribution of cluster ions detected is characterized by a relatively low average mass/charge ratio due to the presence of multiply charged cluster ions; in addition, there is a marked reduction in duster ions having a magic number of molecules. Product ion mass spectra obtained by tandem mass spectrometry of cluster ions are characterized by a base peak having a magic number of molecules that is less than and closest to the number of molecules in the precursor ion. Structures have been proposed for some dications and some quadruply charged ions. At pH 3 and 11, the mass spectra of NaCl clusters show the presence of mixed clusters of NaCl with HCl and NaOH, respectively. The effects of ionic radius on 20 distributions of cluster ions for 10 salts were investigated; however, the fine structure of these effects is not readily discerned. Copyright (C) 2001 John Wiley & Sons, Ltd.

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Documento generato il 30/03/20 alle ore 00:42:15