Thermal desorption induced by kiloelectronvolt ion bombardment of thiol-bound self-assembled monolayers on gold

D. E. Riederer, R. Chatterjee, S. W. Rosencrance, Z. Postawa, T. D. Dunbar, D. L. Allara, N. Winograd

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Time distributions of neutral molecules desorbed from a chemisorbed self-assembled monolayer of phenylethanethiol on gold have been measured subsequent to 8 keV Ar+ and H2+ ion bombardment. These distributions show that, regardless of the projectile used, most of the ejected molecules leave the surface with thermal kinetic energies (~0.03 eV). The shapes of the distributions have a strong surface temperature dependence over the range 240-300 K. This behavior is well described by a convolution of the Maxwell-Boltzmann distribution and the rate equation for first-order desorption. The results imply that kiloelectronvolt ion bombardment initiates a process which breaks the adsorbate-surface bond, leaving the resulting physisorbed molecules to evaporate after attaining thermal equilibrium with the substrate. A mechanism for this gentle cleavage of the adsorbate-substrate bond is proposed.

Original languageEnglish (US)
Pages (from-to)8089-8094
Number of pages6
JournalJournal of the American Chemical Society
Volume119
Issue number34
DOIs
StatePublished - Aug 27 1997

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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