Abstract
A previously developed theory (Fabrikant 2007 Phys. Rev. A 76 012902) is applied to the calculation of dissociative electron attachment to CH3I molecules condensed at the surface of a Kr film. The effect of vibrational Feshbach resonance that strongly dominates attachment in the gas phase is strongly suppressed in the condensed phase. This leads to an order of magnitude reduction of the condensed-phase cross section as compared to the gas phase cross section, in spite of the lower resonance width and higher negative-ion survival probability in the condensed phase. The result agrees with recent measurements (Jensen and Sanche 2008 J. Chem. Phys. 129 074703), although the peak in the cross section as a function of the electron energy is narrower than the experimental peak. When the adsorbed molecules are covered by an additional Kr film on top, the dissociative attachment cross section grows rather fast. This result does not agree with the experiment for physisorbed CH3I covered by a 2 ML of Kr film, perhaps due to inaccuracy of the continuous-medium approximation employed in the calculations.
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