2. Photoionization of atoms The photoelectric effect works just as well with ind

Question

2. Photoionization of atoms The photoelectric effect works just as well with individual atoms or molecules as with bulk matter. However, the ionization potential takes the role of the work function in this case. This can be used to analyze samples using photoelectron spectroscopy. When light of wavelength 193 nm strikes a sample of a certain alkali metal vapor, electrons with kinetic energy 1.285 eV are emitted. Which element is it? Use the NIST Chemistry Web-Book to assign the element. (5 credits)

Explanation / Answer

Work function, W = hc/l - KE

W= 6.42 - 1.285

W= 5.1440 eV

The metal is gold as per the data book mentioned in the question.

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