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ah in this lecture we will be looking at a specific spectroscopy tool ah which has been widely used in materials chemistry and as the title suggests there are two issues that are involved in the spectroscopy the name suggests that it is a x-ray photoelectron spectroscopy therefore there is a x-ray that is produced when a photoelectron is ejected so a combination of ah two processes that are happening brings about a very rich chemistry that one can learn material scientists physicist and chemist have used this technique extensively and this is now a very established tool for characterization materials in the last three decades improvised and very sophisticated instruments have come in the in the last 2 decades the machine could actually occupy a very big room but today the sophistication of this instrumentation has moved such a way that even a benchtop x-ray photoelectrons spectrophotometer can be used so we will look into this issue of what this principle behind the spectroscopic tool
