Filtered white noise and repetitive chirp broadband quadrupolar excitation Fourier transform ion cyclotron resonance mass spectrometry at 1 tesla

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Eur. J. Mass Spectrom. 3, 1 - 9 (1997)

Filtered white noise and repetitive chirp broadband quadrupolar excitation Fourier transform ion cyclotron resonance mass spectrometry at 1 tesla

Cynthia C. Pitsenberger and I. Jonathan Amster^*
Department of Chemistry, University of Georgia, Athens, GA 30, USA.

ABSTRACT:

Radiofrequency (RF) chirp and filtered white noise are compared as wave forms for broadband quadrupolar excitation. Ions are formed by matrix-assisted laser desorption Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry and axialized by quadrupolar excitation. Both quadrupolar excitation waveforms are capable of axializing ions over a range of masses. Remeasurement efficiencies for repetitive chirp excitation are greater than 98%. Remeasurement efficiencies for noise excitation are lower, 80%. The duration of transients recorded using either broadband excitation method is several orders of magnitude longer than for ions that have not been axialized.

Keywords: RF-chirp, filtered white noisse, broadband quadrupolar excitation, matrix-assisted laser desorption, FT-ICR mass spectrometry, axializing ions.

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