Vary question in XPS

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Aug 6th, 2022
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How to vary question in XPS

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hello friends welcome to the second part of the complete series on photoemission spectroscopy in the previous video we have seen the basic principles and instrumentation of xps if you have missed that video you can find the link for the first video in description box now letamp;#39;s talk about the spectra obtained from the xps instrument we have seen that the instrument gives a plot of kinetic energy versus the number of electrons counted so number of electrons counted is plotted in y-axis and kinetic energy is plotted in x-axis so now you can see that it starts from the lower kinetic energy in the left and goes to higher kinetic energy in right as normally a graph is plotted but in most of the modern instruments kinetic energy is converted to binding energy with the formula h nu is equals to binding energy plus kinetic energy plus phi therefore the lower kinetic energy becomes higher binding energy and higher kinetic energy becomes lower binding energy this means now x-axis starts f

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Because XPS is a surface technique, there is a limited amount of organic information XPS can provide. XPS is limited to measurements of elements having atomic numbers of 3 or greater, making it unable to detect hydrogen or helium. XPS spectra also take a long time to obtain.
EDS is more suited for bulk analysis and microscale studies, while XPS is a surface-sensitive technique that provides detailed chemical information about the top layers of a sample.
In XPS, the atoms of the samples surface absorb X-rays and emit electrons, but in XRF the atoms of the sample both absorb and emit X-rays. In XRD, the atoms of the sample do not absorb X-rays at all, they just reflect them.
X-Ray Photoelectron Spectroscopy (XPS) is also known as Electron Spectroscopy for Chemical Analysis (ESCA). X-Ray Photoelectron Spectroscopy is used to determine quantitative atomic composition and chemistry.
This chemical shift is dependent on the electronegativity (electron withdrawing power) of atoms bonded to carbon. Oxygen having more electron withdrawing power than carbon or hydrogen results in an increase in the C-O binding energy relative to C-C. Multiple bonds to electronegative atoms as in O-C=O.
Ultraviolet Photoelectron Spectroscopy UV photoelectron spectroscopy (UPS) is a technique very similar to XPS but which uses UV photons rather than X-ray photons to excite photoelectrons from the surface.
The quantitative accuracy for the weaker XPS signals, that have peak intensities 10-20% of the strongest signal, are 60-80% of the true value, and depend upon the amount of effort used to improve the signal-to-noise ratio (for example by signal averaging).
XPS: XPS is based on the photoelectric effect. X-rays are used to eject photoelectrons from the surface of a material, and the energy of these electrons is measured to provide information about the samples composition and chemical states. SEM: SEM uses a focused beam of electrons to scan the surface of a sample.

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