ELECTRON INELASTIC MEAN FREE PATH IN CARBON AND POLYCARBONATE USING NEWLY DEVELOPED WIDE ENERGY SPECTRUM MEASUREMENT METHOD
2Nuclear Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel
3The Nano-Fabrication Center, Ben-Gurion University of the Negev, Beer-Sheva, Israel
4SpLine, Spanish CRG Beamline at The European Synchrotron Radiation Facility, Grenoble, France
5SpLine, Instituto de Ciencia de Materiales de Madrid, Madrid, Spain
The electron Inelastic Mean Free Path (IMFP) is most commonly used in surface analysis techniques such as X-ray photoelectron spectroscopy. Though numerous studies were conducted defining the IMFP value, it is still mostly substantiated on calculations and extrapolations. Experimental methods such as elastic-peak electron spectroscopy, tends to relay on indirect measurements. Main disadvantage of the current methods is the decreasing signal to noise ratio as the layer thickness increases and with the electron energy decreases.
Newly developed Wide Energy Spectrum method (WES), published by our group [1], allows a direct assessment of the IMFP for different energies. It exploits the attenuated electron multiple inelastic collisions (MIC) peak counts rather than use the signal electron peaks and calculates the mean electron energy loss.
WES experimental values of the electron IMFP for Polycarbonate and Carbon were measured, analyzed and compared to the calculated NIST prediction formulas values [2]. The experiment was performed at the Spanish beam-line at the ESRF and the initial results are presented.
References:
[1] Givon A. et al., “Hard X-Ray Photoelectron Spectroscopy Study of Electron Spectral Structure beyond the Known Signal Electron Peak”, J. Chem. Chem. Eng., 7 (2013), 601–605.
[2] Powell C. J. and Jablonski A., “NIST Electron Inelastic-Mean-Free-Path Database: Version 1.2,”.
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