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Table 2

Binding energies (corresponding to a water ice surface) of selected species.

Species Binding energy [K]

H 450
H2 500
C 800
N 800
N2 1000
O2 1000
CO 1150
O 1390
NH 2378
OH 2850
NH2 3956
NH3 5534
H2O 5700

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