Radiant energy – Ionic separation or analysis
Reexamination Certificate
2002-10-24
2008-11-11
Vanore, David A. (Department: 2881)
Radiant energy
Ionic separation or analysis
C250S309000, C378S045000
Reexamination Certificate
active
07449682
ABSTRACT:
Characterization of a sample, e.g., a depth profile, may be attained using one or more of the following parameters in an electron spectroscopy method or system. The one or more parameters may include using low ion energy ions for removing material from the sample to expose progressively deeper layers of the sample, using an ion beam having a low ion angle to perform such removal of sample material, and/or using an analyzer positioned at a high analyzer angle for receiving photoelectrons escaping from the sample as a result of x-rays irradiating the sample. Further, a correction algorithm may be used to determine the concentration of components (e.g., elements and/or chemical species) versus depth within the sample, e.g., thin film formed on a substrate. Such concentration determination may include calculating the concentration of components (e.g, elements and/or chemical species) at each depth of a depth profile by removing from depth profile data collected at a particular depth (i.e., the depth for which concentration is to be calculated) concentration contributions attributable to deeper depths of the sample. In addition, characterization of a sample, e.g., determination of a component's concentration in a thin film, may be attained by providing calibration information representative of surface spectrum measurements for a plurality of samples correlated with depth profile information for the plurality of samples. At least one characteristic of the sample to be characterized (e.g., concentration of a component) is determined based on one or more surface spectrum measurements for the sample to be characterized and the calibration information.
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Larson Paul E.
Moulder John F.
Perloff David S.
Watson David G.
Blakely & Sokoloff, Taylor & Zafman
Johnston Phillip A.
Revera Incorporated
Vanore David A.
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