A radiotracer study of slow electron interaction with co on polycrystalline Mo

The interaction of slow (50–300 eV) electrons with CO chemisorbed on a polycrystalline Mo ribbon was investigated. A radiotracer was employed to monitor C concentration on the surface and desorbed ions were collected. From the time variation of the ion current, total electron induced desorption cross sections of 3.7 × 10 −17 to 1.6 × 10 −16 cm 2 were obtained. The desorption cross section for C containing species was found to be less than 1.4 × 10 −19 cm 2. In addition, the sticking coefficient for CO on Mo was found to be 0.13–0.16. These results are discussed in terms of the states of chemisorbed CO and the conclusions of other investigations of this systems.