Fig. 2

IR spectra obtained after the codepositions of (a) C2H2 + O2 + H (exp. 3), and (b) C2H2 + 18O2 + H (exp. 4) for 360 min at 10 K. The applied deposition ratio of C2H2:(18)O2:H was 1:10:40, and the used H-atom flux was 1.2 × 1013 atoms cm−2 s−1 The dashed lines are shown for the peak positions of regular molecules. IR spectra are offset for clarity.
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