The Electrostatic Ion Beam Trap : a mass spectrometer of infinite mass range

Details The Electrostatic Ion Beam Trap : a mass spectrometer of infinite mass range The Electrostatic Ion Beam Trap : a mass spectrometer of infinite mass range

2011-05-03

arxiv.org/abs/1105.0499v1

Physics

Atomic Physics

Scientific paper

We study the ions dynamics inside an Electrostatic Ion Beam Trap (EIBT) and show that the stability of the trapping is ruled by a Hill's equation. This unexpectedly demonstrates that an EIBT works like a quadrupole trap. The parallelism between these two kinds of traps is illustrated by comparing experimental and theoretical stability diagrams of the EIBT. The main difference with quadrupole traps is that the stability depends only on the ratio of the acceleration and trapping electrostatic potentials, not on the mass nor the charge of the ions. Our model is confirmed by the experimental observation of parametric resonances in the EIBT, where ions excited to their oscillation frequency are ejected out of the trap. These frequencies are proportional to the square root of the charge/mass ratio of each trapped species, while the stability is independent of the mass and charge. The EIBT can thus be used as a mass spectrometer of infinite mass range.

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