Fig. 7
Modelling results of the desorption energy distributions (K) of methylamine on
graphite (HOPG) and np-ASW ice surfaces. Top panel: surface population (ML) of
CH3 NH2
(m∕z = 31)
as a functionof the desorption energy (K) for an exposure dose N = 1 ML
of CH3 NH2
on the HOPG surface. Bottom panel: surface population (ML) of NH2CH3
as a functionof the desorption energy (K) for an exposure dose N = 0.30 ML
of CH3 NH2
on the surface of the np-ASW ice film of 10 ML thickness, prepared at 110 K and cooled down to 40 K. The desorption
energy distribution (Ei)
and the surface population (Ni)
of methylamine are derived from Eq. (5) with the best pre-exponential factor
A = 1012 s−1
for the two exposure doses 
on HOPG and 
on np-ASW ice surfaces.
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