Upper panel: infrared optical depth spectra of a-C:H sample during TPD, after irradiation to a fluence of 2 × 1012 ion/cm2 with 132Xe21 + at 100 K. The inset shows a close-up of the H2 absorption region. Lower panel (left): integrated optical depth for H2, CH4, and C2H2 bands as a function of fluence. Evaluated errors bars on the integration are shown for one fluence; (right): evolution of infrared and mass signals of the considered molecules during TPD.
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