Surface characterization of diamond-like carbon for ultracold neutron storage

被引：10

作者：

Atchison, F. ^{[1
]}

Bergmaier, A. ^{[2
]}

Daum, M. ^{[1
]}

Doebeli, M. ^{[1
,3
]}

Dollinger, G. ^{[2
]}

Fierlinger, P. ^{[1
]}

Foelske, A. ^{[1
]}

Henneck, R. ^{[1
]}

Heule, S. ^{[1
,4
]}

Kasprzak, M. ^{[1
,5
]}

Kirch, K. ^{[1
]}

Knecht, A. ^{[1
,4
]}

Kuzniak, M. ^{[1
,6
]}

Pichlmaier, A. ^{[1
]}

Schelldorfer, R. ^{[1
]}

Zsigmond, G. ^{[1
]}

机构：

[1] Paul Scherrer Inst, CH-3052 Villigen, Switzerland

[2] Univ Bundeswehr Munchen, D-85577 Neubiberg, Germany

[3] ETH, CH-8093 Zurich, Switzerland

[4] Univ Zurich, CH-8057 Zurich, Switzerland

[5] Stefan Meyer Inst, Vienna, Austria

[6] Jagiellonian Univ, Marian Smoluchowski Inst Phys, Krakow, Poland

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2008年 / 587卷 / 01期

关键词：

diamond-like carbon (DLC); sp(3) content; X-ray-induced photoelectron spectroscopy (XPS); secondary-ion mass spectroscopy (SIMS); elastic recoil detection analysis (ERDA); storage of ultracold neutrons;

D O I：

10.1016/j.nima.2007.12.037

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

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(3) 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 x 10(16) cm(-2) 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 x 10(-4). Temperature cycling of mechanically pre-stressed samples between 77 and 380 K revealed no detrimental effect. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：82 / 88

页数：7

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