Electron stimulated desorption of H- ions from condensed acetic acid

The interaction between low energy electrons and condensed acetic acid has been investigated considering H- and D- ions Electron Stimulated Desorption from the three isotopic forms CD3COOD, CD3COOH and CH3COOD. For all isotopic forms the yields of desorbing H-(D-) ions are nearly identical, peaking at an incident electron energy of similar to 9.75 eV, and no differences are observed in H-(D-) kinetic energy distributions. The intensities of H- and D- ion signals from CD3COOH and CH3COOD suggest a selectivity in the production of ions, that seems more efficient from the acid group -COOH(D) than from the methyl group -CH(D)(3) of these molecules. (c) 2006 Elsevier B.V. All rights reserved.