Enhanced dissociative electron attachment to CF2Cl2 by transfer of electrons in precursors to the solvated state in water and ammonia ice -: art. no. 153403

We present direct evidence that the presence of polar molecules greatly enhances dissociative electron attachment (DEA) of similar to0 eV electrons to CF2Cl2. The absolute DEA cross sections are found to be similar to1.3 X 10(-14) and similar to9.7 x 10(-14) cm(2) for 0.1 monolayer (ML) CF2Cl2 on 5 ML H2O and 5 ML NH3 ice grown on Kr, respectively. They are similar to 130 and similar to 970 times larger than the gaseous values. This enhancement is due to the transfer of electrons in the precursor states, rather than the transfer of solvated electrons in water or ammonia ice.