Temperature-programmed desorption curves of m/z 27 of hydrogen cyanide HCN without exposure to the room-temperature atomic H-beam at 15 K (dotted line), and with exposure during 20 min (dashed line), one hour (dotted-dashed line) and three hours (full line). The warm atomic H2 beam induces a change in morphology that shifts the desorption maximum to higher temperatures, as shown by the TPD curve obtained after three hours exposure to the H2 beam with the plasma discharge off (large dashed line).
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