B. Sundqvist, A. Hedin, P. Håkansson, I. Kamensky, J. Kjellberg, M. Salephour, G. Säwe, S. Widdiyasekera
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Protein ion production by fast heavy ion induced desorption
Fast heavy ions from the Uppsala EN-tandem accelerator, as well as fission fragments from a 252Cf-source, have been used to produce quasi-molecular ions of proteins in the molecular weight range 1000–14000. Measured time-of-flight spectra show contributions of neutrals, metastable ion decay products, Coulomb breakup of multiply charged ions and polymer ions. The mechanism for production of these quasi-molecular ions will be discussed within the framework of an ion-track model.
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