Xps Universiti Malaya

By | February 7, 2018


Xps Universiti Malaya

Xps Universiti Malaya,  Xps is the acronym of X-RAY PHOTOELECTRON SPECTROSCOPY and it is an instrument used in the science field and for that we say the X-Ray Photoelectron Spectroscopy is a quantitative analysis tool that can provide the elemental composition (excluding hydrogen) and information on chemical bonding environments and oxidation states within the upper 1-10 nm of the surface.

Details of Instrument: Detail :
X-Ray Photoelectron Spectroscopy is a quantitative analysis tool that can provide the elemental composition (excluding hydrogen) and information on chemical bonding environments and oxidation states within the upper 1-10 nm of the surface.
Principle:
An X-ray beam (photon energy, hν) is focused onto a surface resulting in the ejection of electrons with kinetic energies (KE) characteristic of the atoms and bonding environments they originated from. Measured kinetic energies are converted to binding energies (BE) via:
KE = hν – BE – Φ
where Φ is the work function of the instrument.
What XPS Can Offer In Surface Characterizations
1. Survey Spectra
The number of electrons is plotted as a function of binding energy to produce survey spectra. These spectra show the elemental composition of the surface (excluding hydrogen and helium).
2. High Resolution Spectra
The binding energy of a photoelectron reflects the bonding environment it was emitted from. Accurate measurement of peak positions after deconvolution of high resolution spectra provides quantitative chemical state information.
Sample Type :
1. Solid
2. Powder
3. Dry sample and thin sample
Sample size : Not more than 2cm x 2cm for solid. Thickness not more than 1cm.
Amount required : Small amount (about 5g only).