 Solution

ID: past-exam-of-the-chemistry-course-of-the-year-4-of-the-natural-sciences-course-of-the-university-of-cambridge/2022/paper-3/section-b/38/c/solution

Fixed entrance retardation and fixed pass energy select the same pre-retardation kinetic energy, 111.4 eV. The required photon energy is therefore

h ν_{C} = E_{B, C} + ϕ_{a} + K_{a} = 284.8 + 4.4 + 111.4 = 400.6 eV .

It is lower than the original excitation by exactly the difference between the two core binding energies, 114.4 eV.

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