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Title: Practical Analysis of materials with depth varying compositions using FT-IR photoacoustic spectroscopy (PAS)

FT-IR photoacoustic spectroscopy (PAS) is discussed as a nondestructive method to probe the molecular composition of materials versus depth on the basis of the analysis of layers of experimentally controllable thickness, which are measured from the sample surface to depths of some tens of micrometers, depending on optical and thermal properties. Computational methods are described to process photoacoustic amplitude and phase spectra for both semi-quantitative and quantitative depth analyses. These methods are demonstrated on layered and gradient samples.
Authors:
; ;
Publication Date:
OSTI Identifier:
832903
Report Number(s):
IS-M 920
TRN: US200430%%916
DOE Contract Number:
W-7405-Eng-82
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 30 Sep 2004
Research Org:
Ames Laboratory, Ames, IA (US)
Sponsoring Org:
USDOE Office of Science (SC) (US)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; PHOTOACOUSTIC SPECTROSCOPY; CHEMICAL COMPOSITION; VARIATIONS; DEPTH; MATERIALS