Multiple Ionization of Free Ubiquitin Molecular Ions in Extreme Ultraviolet Free-Electron Laser Pulses

Thomas Schlathölter, Geert Reitsma, Dmitrii Egorov, Olmo Gonzalez-Magaña, Sadia Bari, Leon Boschman, Erwin Bodewits, Kirsten Schnorr, Georg Schmid, Claus Dieter Schröter, Robert Moshammer, Ronnie Hoekstra

OnderzoeksoutputAcademicpeer review

13 Citaten (Scopus)
7 Downloads (Pure)


The fragmentation of free tenfold protonated ubiquitin in intense 70femtosecond pulses of 90eV photons from the FLASH facility was investigated. Mass spectrometric investigation of the fragment cations produced after removal of many electrons revealed fragmentation predominantly into immonium ions and related ions, with yields increasing linearly with intensity. Ionization clearly triggers a localized molecular response that occurs before the excitation energy equilibrates. Consistent with this interpretation, the effect is almost unaffected by the charge state, as fragmentation of sixfold deprotonated ubiquitin leads to a very similar fragmentation pattern. Ubiquitin responds to EUV multiphoton ionization as an ensemble of small peptides.

Originele taal-2English
Pagina's (van-tot)10741-10745
Aantal pagina's5
TijdschriftAngewandte Chemie - International Edition
Nummer van het tijdschrift36
StatusPublished - 26-aug.-2016

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