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Fig. 1
a) Infrared spectrum of an HNCO:NH3 ice mixture in a 1:20 ratio. OCN− has a band at 2151 cm-1. HNCO has a band at 2259 cm-1 corresponding to HNCO in a NH3 environment. b) Difference spectrum with respect to t = 0 s of the HNCO 2259 cm-1 band at T = 15 K at t = 5300 s, 10 000 s, 21 000 s, and 31 000 s.
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