Protein and peptide cross sections and mass spectra in an electrostatic ion beam trap

Z. Fradkin, D. Strasser, O. Heber, M. L. Rappaport, M. Sharon, B. A. Thomson, I. Rahinov, Y. Toker, D. Zajfman

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Among the advantages of an electrostatic ion beam trap (EIBT), which is based on purely electrostatic fields, are mass-unlimited trapping and ease of operation. We have developed a new system that couples an electrospray ion source to an EIBT. Between the source and EIBT there is a Paul trap in which the ions are accumulated before being extracted and accelerated. After the ion bunch has entered the EIBT, the ions are trapped by rapidly raising the voltages on the entrance mirror. The oscillations of the bunch are detected by amplifying the charge induced on a pickup ring in the center of the trap, the ion mass being directly proportional to the square of the oscillation period. The trapping of biomolecules in the RF-bunching mode of the EIBT is used for measurement of mass spectra and collision cross sections. Coalescence of bunches of ions of nearby mass in the self-bunching mode is also demonstrated.

Original languageEnglish
Article numberP05008
JournalJournal of Instrumentation
Issue number5
StatePublished - 12 May 2017

Bibliographical note

Publisher Copyright:
© 2017 IOP Publishing Ltd and Sissa Medialab srl.


  • Low-energy ion storage
  • Mass spectrometers


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