Raman micro-spectroscopy as a tool to measure the absorption coefficient and the erosion rate of hydrogenated amorphous carbon films heat-treated under hydrogen bombardment

Cedric Pardanaud (1) , E. Aréou (1) , C. Martin (1) , R. Ruffe (1) , T. Angot (1) , P. Roubin (1) , C. Hopf (2) , T. Schwarz-Selinger (2) , W. Jacob (2)

1 PIIM - Physique des interactions ioniques et moléculaires
2 IPP - Max-Planck-Institut für Plasmaphysik [Garching]

We present a fast and simple way to determine the erosion rate and absorption coefficient of hydrogenated amorphous carbon films exposed to a hydrogen atomic source based on ex-situ Raman micro-spectroscopy. Results are compared to ellipsometry measurement. The method is applied to films eroded at different temperatures. A maximum of the erosion rate is found at ~ 450 °C in agreement with previous results. This technique is suitable for future quantitative studies on the erosion of thin carbonaceous films, especially of interest for plasma wall interactions occurring in thermonuclear fusion devices.

Mots clés: Amorphous hydrogenated carbon; Optical properties characterization; Raman spectroscopy; Erosion process

Domaines: Chimie-Physique [physics.chem-ph]

Cedric Pardanaud, E. Aréou, C. Martin, R. Ruffe, T. Angot, et al.. Raman micro-spectroscopy as a tool to measure the absorption coefficient and the erosion rate of hydrogenated amorphous carbon films heat-treated under hydrogen bombardment. Diamond and Related Materials, 2012, 22, pp.92-95. ⟨10.1016/j.diamond.2011.12.015⟩. ⟨hal-00852728⟩