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Fig. 5


Temperature-programmed desorption spectra of m/z 28 and 29 of HCN without exposure to the atomic H-beam at 15 K (a) and after 20 min (b), one hour (c), and three hours (d) exposure at 15 K; m/z 28 shows the change in morphology of HCN during the hydrogenation experiment. No contribution from CH2NH is visible in the m/z 29 curve.

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