کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1691690 1011328 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chemical sputtering and surface damage of graphite by low-energy atomic and molecular hydrogen and deuterium projectiles
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سطوح، پوشش‌ها و فیلم‌ها
پیش نمایش صفحه اول مقاله
Chemical sputtering and surface damage of graphite by low-energy atomic and molecular hydrogen and deuterium projectiles
چکیده انگلیسی

We present experimental methane production yields for H+, H2+,H3+,andD2+ ions incident on ATJ graphite in the energy range 10–250 eV/H. Below about 60 eV/H, the molecular H species give higher methane yields/H when compared with isovelocity H+, similar to our earlier measurements for incident deuterium atomic and molecular ions. For both D and H atomic and molecular projectiles, the yields/atom coalesce onto a single curve below projectile energies of ∼60 eV/atom, when plotted as a function of maximum energy transfer, under the assumption that, below this energy, the incident molecular species are largely undissociated when undergoing C–C bond breaking collisions during their collision cascade and thus produce more damage. Raman spectroscopy of a graphite sample exposed to high fluences of D+ and D3+ beams at high and low energies qualitatively confirmed the assumption that more surface damage is produced by the low-energy incident molecular species than by isovelocity atomic ions. While the two high-energy beam-exposed spots showed similar damage, the low-energy molecular-beam-exposed spot showed slightly more damage than the corresponding D+-beam-exposed spot.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vacuum - Volume 82, Issue 9, 2 May 2008, Pages 880–887
نویسندگان
, , , ,