Universal scaling for biomolecule desorption induced by swift heavy ions

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

A thermal activation mechanism is proposed for the desorption of biomolecules. Good agreement is found with the experiments in a broad range of the electronic stopping power. The activation energies of desorption U are 0.33, 1.57 and 5.35 eV for positive, negative and neutral leucine molecules, respectively, and 2.05 eV for positive ergosterol molecules. The desorption of valine clusters is analyzed. The magnitude of the specific heat shows that the internal degrees of freedom are not excited up to the moment of desorption. The effect of irradiation temperature and of ion velocity on the desorption yield is discussed on the basis of the author's model. The scaling function derived in the model for the desorption of biomolecules is applied also to the sputtering of SiO2 and U = 0.42 eV is obtained.

Original languageEnglish
Pages (from-to)70-77
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume233
Issue number1-4
DOIs
Publication statusPublished - May 1 2005
EventFast Ion-Atom Collisions Proceedings of the Eight Workshop on Fast Ion-Atom Collisions -
Duration: Sep 1 2004Sep 3 2004

Keywords

  • Electronic sputtering
  • Leucine
  • SiO
  • Thermal activation
  • Thermal spike

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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