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Table 2

Critical points of the hydrogenation path on ice models from HNCO to NH2CHO.

Method (**) n CCSD(T)(*) /B1 CCSD(T)(*) /B2 M062X/B3 MPWB1K/B3
HNCO(1A′) + 2 H(2S) 1 0.0 0.0 0.0 0.0
2 0.0 0.0 0.0
3 0.0 0.0 0.0
HNCO—Layer (1A) + 2 H (2S) 48 0.0 0.0

TS1 (2A′) + H(2S) 1 9.1 9.0 10.0 9.5
2 8.4 9.2 8.8
3 8.0 8.8 8.5
TS1-Layer (2A) + H(2S) 48 8.7 8.5

NH2CO(2A′) + H(2S) 1 –28.9 –29.0 –28.6 –30.3
2 –29.2 –28.6 –30.5
3 –27.7 –26.9 –29.2
NH2CO—Layer (2A′) + H (2S) 48 –28.0 –28.4

TS3 (2A) + H(2S) 1 17.8 17.7 14.7 14.7
2 12.8 10.8 11.6
3 12.3 9.8 11.4
TS3-Layer (2A) + H (2S) 48 7.9 11.4

HNCHO(2A) + H(2S) 1 –8.1 –7.5 –6.9 –8.7
2 –9.0 –7.6 –9.2
3 –8.4 –6.8 –8.6
HNCHO-Layer(2A) + H (2S) 48 –6.8 –8.3

NH2CHO(1A′) 1 –122.1 –122.7 –121.9 –122.6
2 –122.9 –122.3 –123.3
3 –121.2 –120.4 –121.7
NH2CHO–Layer (1A) 48 –121.1 –121.1

Notes. (*)Geometries optimized at the MP2/aug-cc-pVTZ level. Basis sets: B1 = aug-cc-pVTZ; B2 = aug-cc-pVQZ; B3 = 6-311++G(3df,2p); n = number of supporting H2O. (**)Energy differences along the reaction paths include zero-point vibrational energies in kcal/mol.

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