Temperature_Programmed Desorption

(b) Analysis cont‰fd

E / R Tp2 = (n v Qpn_1 / b) exp(_ E / R Tp)

for n > 0; b = dT / dt = const.; E, v indep. of Q

where E = Eact(des) = Eact(ads) _ E(ads) = _ E(ads)

Desorption barrier approx. equal to adsorption energy !

Transition State Theory:

v = (k T / h) q‰à / q = 1013 s_1 q‰à / q

for n = 1; vary b or assume v = 1013 s_1

In addition: Need Tdes for UHV STM experiments

Previous slide

Next slide

Back to first slide

View graphic version