Mu. Kislyuk et al., Spatial distributions of desorption flow as an indicator for a precursor state in several systems, KINET CATAL, 41(1), 2000, pp. 71-75
Spatial distributions of the desorption Row (SDDF) of CH4, N-2 and azometha
ne (CH3N=NCH3) on molybdenum, O-2 and N-2 on iridium, and N-2 On iron were
measured by TPD/TPR with angular resolution and described by the Comsa equa
tion. The activation energy of chemisorption and the effect of the precurso
r state on the total desorption rate were estimated from the parameters of
the Comsa equation. The pathway via a precursor state is the main one (60-9
0%) for oxygen on iridium and for nitrogen and azomethane on molybdenum. Fo
r other systems, this pathway cannot be completely excluded either. Accordi
ng to our upper estimates, its contribution can be essential (similar to 40
%).