THERMAL AND ELECTRON-STIMULATED CHEMISTRY OF FOMBLIN-ZDOL LUBRICANT ON A MAGNETIC DISK

被引:41
作者
LIN, JL
BHATIA, CS
YATES, JT
机构
[1] Surface Science Center, Department of Chemistry, University of Pittsburgh, Pittsburgh
来源
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A | 1995年 / 13卷 / 02期
关键词
D O I
10.1116/1.579393
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The thermal and electron-induced decomposition of Fomblin-Zdol lubricant on a rigid magnetic disk with a hard carbon overcoat are studied by temperature-programmed reaction/desorption spectroscopy and electron stimulated desorption. The thermal spectroscopy shows two desorption features peaked at 640 and 700 K resulting from decomposition of the Fomblin-Zdol molecules. The threshold temperature for dissociation of the Fomblin-Zdol molecule is at 500–550 K in accordance with the known thermal stability of the free molecule. HF originating from thermal reactions with either surface OH or surface CH groups is a prominent desorption product. Electron impact also causes Fomblin-Zdol dissociation. Two efficient mechanisms for electron impact dissociation have been resolved separately above and below the ionization threshold of ~ 14 eV. The low-energy process is likely due to the formation of negative ions followed by dissociation (dissociative electron attachment) and has a cross section of ~2X 10–16cm. These results show that Fomblin-Zdol as a lubricant on a magnetic disk is inherently unstable thermally and in the presence of triboelectrons. © 1995, American Vacuum Society. All rights reserved.
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收藏
页码:163 / 168
页数:6
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