Electron capture and loss by protonated peptides and proteins in collisions with C60 and Na
Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark
2 Physics Department, Stockholm University, SCFAB, 106 91 Stockholm, Sweden
Corresponding author: a email@example.com
Published online: 6 November 2002
Electron capture and loss cross-sections have been measured for collisions between fast multiply charged peptide and protein ions [ M+nH] and Na or C60. The ions were produced in an electrospray ion source (ESI) and accelerated to an energy of keV. We find that the size of the cross-sections depend strongly on molecule size, ionization energy and projectile charge state n. For multiply charged ubiquitin projectiles, the cross-sections for electron capture are found to be several times larger with a Na target than with a C60 target. This observation is qualitatively explained by means of an over-the-barrier model for electron transfer using metal-sphere descriptions for the electronic responses of the collision partners.
PACS: 34.70.+e – Charge transfer / 61.48.+c – Fullerenes and fullerene-related materials / 87.15.-v – Biomolecules: structure and physical properties
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003