Differentiation of (18)O- and (16)O-rich layers in anodic alumina films by glow discharge time-of-flight mass spectroscopy

The performance of glow discharge time-of-flight mass spectrometry in isotopic differentiation is revealed using the distribution of oxygen isotopes O-16 and O-18 in barrier-type anodic alumina films as a focus. Anodic alumina films comprising O-18-rich layers of controlled thickness were formed by the appropriate combination of anodising of superpure aluminium in electrolytes enriched with O-18 isotopes and of natural abundance of O-18 isotopes. Analysis of the elemental depth profiles of selected ionic species, i.e. (OO)-O-16-O-18, allowed determination of the locations of the O-18-rich layers and the O-18/O-16 interface. Copyright (C) 2010 John Wiley & Sons, Ltd.

The performance of glow discharge time-of-flight mass spectrometry in isotopic differentiation is revealed using the distribution of oxygen isotopes (16)O and (18)O in barrier-type anodic alumina films as a focus. Anodic alumina films comprising (18)O-rich layers of controlled thickness were formed by the appropriate combination of anodising of superpure aluminium in electrolytes enriched with (18)O isotopes and of natural abundance of (18)O isotopes. Analysis of the elemental depth profiles of selected ionic species, i.e. (16)O(18)O, allowed determination of the locations of the (18)O-rich layers and the (18)O/(16)O interface. Copyright (C) 2010 John Wiley & Sons, Ltd.