On low energy ion scattering spectroscopy and chlorine adsorption on silver

  • Casagrande M
  • Lacombe S
  • guillemont L
 et al. 
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The authors present the results of a comparative study of Cl adsorption on Ag(111) by He+ ISS and other methods, as well as a study of the He+ neutralization rate. Work function and time of flight spectroscopy show that Cl adsorption occurs rapidly in the 0-1.2 L range, and thereafter sats. He+ ISS illustrates the appearance of Cl at low exposures, but the signal remains very weak until ~1.5 L, when the Cl to Ag ISS peak ratio increases strongly. Measurements of He+ neutralization indicate an increase in neutralization in the initial stages of adsorption, and then a decrease at exposures >1.5 L, which the authors relate to AgCl island formation. The enhanced neutralization in the submonolayer chemisorption range explains the low ISS signal corresponding to Cl. The authors assoc. the increase to a lower neutralization on AgCl. The efficiency of Cl detection is thus environment dependent

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  • M Casagrande

  • S Lacombe

  • L guillemont

  • V A Esaulow

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