Understanding heterogeneity in Genesis diamond-like carbon film using SIMS analysis of implants.

ABSTRACT: An amorphous diamond-like carbon film deposited on silicon made at Sandia National Laboratory by pulsed laser deposition was one of several solar wind (SW) collectors used by the Genesis Mission (NASA Discovery Class Mission #5). The film was ~1 μm thick, amorphous, anhydrous, and had a high ratio of sp ³-sp ² bonds (>50%). For 27 months of exposure to space at the first Lagrange point, the collectors were passively irradiated with SW (H fluence ~2 × 10¹⁶ ions cm^-2; He fluence ~8 × 10¹⁴ ions cm^-2). The radiation damage caused by the implanted H ions peaked at 12-14 nm below the surface of the film and that of He about 20-23 nm. To enable quantitative measurement of the SW fluences by secondary ion mass spectros

SUBMITTER: Jurewicz AJG 

PROVIDER: S-EPMC6979530 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature