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Charge-reversal mass spectrum

Figure 10 (A) Neutralization-reionization ( NR ) spectrum of /7-butoxide anions using 02for neutralization and reionization. (B) Charge reversal ("CR ) spectrum of / -butoxide anions using O2. (C) -NIDD spectrum of / -butoxide anions. Reprinted with permission of Wiley-VCH from Hornung G, Schalley CA, Dieterle M, Schroder D and Schwarz H (1997) A study of the gas-phase reactivity of neutral alkoxy radicals by mass spectrometry a-cleav-ages and Barton-type hydrogen migrations. Chemistry a European Journal Z 1866-1883. Figure 10 (A) Neutralization-reionization ( NR ) spectrum of /7-butoxide anions using 02for neutralization and reionization. (B) Charge reversal ("CR ) spectrum of / -butoxide anions using O2. (C) -NIDD spectrum of / -butoxide anions. Reprinted with permission of Wiley-VCH from Hornung G, Schalley CA, Dieterle M, Schroder D and Schwarz H (1997) A study of the gas-phase reactivity of neutral alkoxy radicals by mass spectrometry a-cleav-ages and Barton-type hydrogen migrations. Chemistry a European Journal Z 1866-1883.
Figure Bl.7.7. Summary of the other collision based experiments possible with magnetic sector instruments (a) collision-mduced dissociation ionization (CIDI) records the CID mass spectrum of the neutral fragments accompanying imimolecular dissociation (b) charge stripping (CS) of the incident ion beam can be observed (c) charge reversal (CR) requires the ESA polarity to be opposite that of the magnet (d) neutiiralization-reionization (NR) probes the stability of transient neutrals fonned when ions are neutralized by collisions in the first collision cell. Neutrals surviving to be collisionally reionized in the second cell are recorded as recovery ions in the NR mass spectrum. Figure Bl.7.7. Summary of the other collision based experiments possible with magnetic sector instruments (a) collision-mduced dissociation ionization (CIDI) records the CID mass spectrum of the neutral fragments accompanying imimolecular dissociation (b) charge stripping (CS) of the incident ion beam can be observed (c) charge reversal (CR) requires the ESA polarity to be opposite that of the magnet (d) neutiiralization-reionization (NR) probes the stability of transient neutrals fonned when ions are neutralized by collisions in the first collision cell. Neutrals surviving to be collisionally reionized in the second cell are recorded as recovery ions in the NR mass spectrum.
The negative ion mass spectrum of isothiazole has been studied in detail <92Mi 305-01 >. A main conclusion from a study of collision-induced activation and charge reversal negative ion spectra of isothiazole and its 3-, 4-, and 5-methyl derivatives is that reaction with NH2 gives rise to depro-... [Pg.330]

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See also in sourсe #XX -- [ Pg.91 ]



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