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Present possibilities of thin‐layer analysis by GDOES
Author(s) -
Hoffmann Volker,
Dorka Roland,
Wilken Ludger,
Hodoroaba VasileDan,
Wetzig Klaus
Publication year - 2003
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1575
Subject(s) - glow discharge , resolution (logic) , layer (electronics) , analytical chemistry (journal) , impact crater , thin film , chemistry , optics , materials science , plasma , nanotechnology , physics , chromatography , quantum mechanics , astronomy , artificial intelligence , computer science
The analysis of thin layers of thickness ∼100 nm has become a new field of application for glow discharge optical emission spectroscopy (GDOES). In this paper an overview is given of the experiences and possibilities gained by the authors in later years at their research, development and application of GDOES. During GDOES analysis of a multilayer system the depth resolution was determined using the inverse maximal slope method. Under optimized discharge conditions a depth resolution of ∼25 nm at 100 nm depth was achieved. The gas flow in a Grimm‐type source for glow discharge mass spectrometry (GDMS) was simulated and a correlation between calculated pressure and crater shape was found. Cleanness of the sample and source turned out to be essential for a fast stabilization time and reduction of the influence of light elements and molecules. Thereby, a 10 nm layer at the top surface of a sample could be quantified. Apart from the influence of density, the reflectivity of the sample surface is discussed. It is shown that a high sample reflectivity can cause up to 100% more light to be measured by the spectrometer. Copyright © 2003 John Wiley & Sons, Ltd.