Abstract
A tandem mass spectrometer is described for neutralization–reionization studies of ions produced by electrospray ionization. The instrument consists of a high current electrospray source, an electrodynamic ion funnel, and an octopole ion guide that transport the ions into the high vacuum region of the tandem mass spectrometer. The ions are accelerated to 8250 eV and submitted to collisional neutralization and reionization, followed by deceleration, separation by kinetic energy and/or mass, and detection. The performance of the ionizer and ion transfer elements is optimized as a function of background pressure and the applied rf and dc potentials. Examples are given for neutralization–reionization mass spectra of protonated adenine, heterocycles, and β-alanine- N-methyl amide.
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