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Fig. 2

image

Left panel: TPD spectra of C2H2 + CO + H (top; exp. 1.0) and propanal (bottom; exp. 2.3) taken after deposition at 10 K. Right panel: QMS fragmentation pattern of two m/z values that are normalized to the QMS signal of the C3H6O+ ion (or the corresponding isotopologue) found in the propanal (exp. 2.3), C2H2 + CO + H (exp. 1.0), C2H2 + C18O + H (exp. 1.3), and C2H2 + 13C18O + H (exp. 1.4) experiments.

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