Fig. 5
Modelling results of the desorption rates (ML s−1)
and the desorption energy distribution (K) of formamide on graphite (HOPG) surface. Top panel: red crosses indicate TPD
data of NH2CHO
(m∕z = 45)
on HOPG surface for different exposure doses of 0.14, 0.30, 0.61, and 1.0 ML; blue lines: the best fits of the TPD curves of
NH2CHO
from the HOPG surface, calculated with the pre-exponential factor A = 1018 s−1
are shown. Bottom panel: the surface population (ML) of NH2CHO
on HOPG surface as a function of the desorption energy (K) is shown. The desorption energy distribution
(Ei)
and the surface population (Ni)
of formamide are derived from Eq. (5) with the best pre-exponential factor
A = 1018 s−1
for the exposure dose 
.
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