Question

4. a) In photoelectron spectroscopy, explain how the binding energies are found by using the energy of the incident X-rays. b) Draw the band diagram of the surface and the spectrometer and explain your answer in (a) using this schematic.

Answer 1

Photoelectron spectroscopy of x-rays indicent X-ray photoelectron spectro scopy quantitative spectroscopic technique that mea elemental composition at the parts per to ctron spectroscopy is a surface sensitive roscopic technique that measures the empirical formula chemical stato Cel formula chemical state and electronic stand that exist within a elements material Binding energies are found as When photo emission event take plac energy conservation Yele holds to emission event takes place, the following hu= lebl + Ekin Ebla hu-KE where Binding energies will depends on is the pohoton energy and ke is the kinetic the ho energy of the photo electron * If reference is taken with respect to Fermi level Cas it is typically come in photo electron spectroscopy) energy E must be replaced by the sum of binding (B6) relato the Fermi level, (E6), and sample work function to

Ejected photo electron incident x-ray. free electron level conduction band] Fermi level valence and I leo ap- (2,63 23 - @l@

* res spectral lines are identified by the shell from the electron was ejected (15,25,20.etc which * The ejected photo electron was kinetic enero KE = hu-BE