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Table 2

Experimental reaction rates k1 (HNCO + H2O  →  OCN+ H3O+ reaction) and k2 (OCN+ H3O+  →  HOCN + H2O reaction) as a function of temperature.

Reaction rates

Temperature (K) k1 (s-1) k2 (s-1)
110 0.20  ×  10-3 .
115 0.59  ×  10-3 2  ×  10-3
120 0.12  ×  10-2 9  ×  10-3
120 0.15  ×  10-2 2  ×  10-2
120 0.26  ×  10-2 .
120 0.13  ×  10-2 2  ×  10-2
125 0.65  ×  10-2 4  ×  10-2
130 0.13  ×  10-1 .
130 0.16  ×  10-1 .
130 0.11  ×  10-1 .

Notes. Not all experiments have enough OCN formed initially at the deposition to form an observable amount of HOCN during the experiment and measure k2.

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