Energy distributions of CD4 and CD3 chemically released from graphite by D+ and D0/Ne+ impact

Time-of-flight (TOF) experiments were performed to determine the energy distributions of CD4 and CD3 chemically released from graphite by energetic D+ ion impact or by a synergistic reaction of Ne+ ions and D atoms at temperatures near 800 K and room temperature (RT). The energy distribution of CD4 chemically released from graphite at 800 K by 400 eV D+ impact can be fitted by two Maxwell–Boltzmann (MB) distributions, one corresponding to the target temperature (800 K) and a faster one (40%) corresponding to 2000 K. In the synergistic reaction of D0 atoms and 3 keV Ne+ ions impacting on graphite at 830 K nearly all formed CD3 are released by an MB distribution corresponding to 830 K. At room temperature, the time-dependent behavior of the CD4 signal, after stopping the D+ or the Ne+ irradiation in the synergistic reaction case, indicates that no physical sputtering process is involved in this reaction. During synergistic reaction of graphite at room temperature with D0/Ne+, the released CD4 can be fitted by two MB distributions corresponding to 1200 and 285 K.