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Henneck, R.
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article
Surface characterization of diamond-like carbon for ultracold neutron storage
Abstract
We report the characterization of diamond-like carbon (DLC) surfaces to be used for the storage of ultracold neutrons (UCN). The samples investigated were 100-300-nm-thick tetragonal amorphous carbon (ta-C) coatings produced by vacuum-arc technology on thin foils (0.1-0.2 mm aluminum, stainless steel, PET). The diamond sp <SUP>3</SUP> fraction was determined by X-ray photoelectron spectroscopy (XPS) to be in the range 45-65%. Secondary-ion mass spectroscopy (SIMS) and elastic recoil detection analysis (ERDA) yielded consistent results for the hydrogen contribution (about 1×10 <SUP>16</SUP> cm <SUP>-2</SUP> within the top 20 nm), strongly concentrated within a surface layer of 1 nm thickness. The boron contamination was found to be around 50 at. ppm. The fractional hole area of the coatings is on a level of about 1×10 <SUP>-4</SUP>. Temperature cycling of mechanically pre-stressed samples between 77 and 380 K revealed no detrimental effect....