Provider: ingentaconnect
Database: ingentaconnect
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TY - ABST
AU - Proctor, Andrew
AU - Hercules, David M.
TI - Inelastic Background and Peak Area Determination in X-Ray Photoelectron Spectroscopy (ESCA)
JO - Applied Spectroscopy
PY - 1984-07-01T00:00:00///
VL - 38
IS - 4
SP - 505
EP - 518
KW - Computer algorithms
KW - ESCA
KW - Data analysis
KW - Quantitative analysis
N2 - Analysis of the Au 4f ESCA spectra of thin gold films deposited over a graphite base shows that as the separation from the main photoelectron peak, ΔE, increases the background decreases. Conversely, the effect of a contaminant overlayer on solid gold gives rise to a background
which increases as ΔE increases. There is, therefore, a considerable variety of background profiles which can be encountered in real samples, which depends markedly on the element, its concentration, and its distribution in the sample. Over the region of the photoelectron line signal
itself, the simple integral description which assumes that the background is proportional to the number of electrons of higher kinetic energy is reasonably valid and is suggested for peak area measurement when a nonlinear profile is needed.

Direct integration and curve fitting techniques
constitute the two main methods of peak area measurement. Simulated Ni 2p spectra are used to compare the effectiveness of the simple integral and linear background profiles for producing the correct peak areas. Although the simple integral profile shows more consistency and is to be preferred
in general, certain fortuitous cancellation effects, particularly with nonmonochromatized spectra, make areas using the linear background fairly accurate in some instances. Curve fitting can overcome many of the problems of direct integration resulting from severe peak overlap. Two types of
Gaussian/Lorentzian functions with a suitable exponential tailing function, which has a finite area over reasonable integration limits, are discussed with regard to their use in non-linear least-squares curve fitting methods. Also discussed is the usefulness of composite and difference spectra
as simpler methods of determining the relative areas of overlapping peaks.
UR - http://www.ingentaconnect.com/content/sas/sas/1984/00000038/00000004/art00006
M3 - doi:10.1366/0003702844555205
UR - http://dx.doi.org/10.1366/0003702844555205
ER -