6. The photoelectron spectrum of sulfur contains p…


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20.50

6. The photoelectron spectrum of sulfur contains peaks at the following ionization energies: 239MJ/mol, 22.7MJ/mol, 16.5MJ/mol, 2.05MJ/mol and 1.00MJ/mol. (a) Draw the expected photoelectron spectrum on the plot below and label each peak with its principle shell, subshell and number of electrons (for instance: 1s2). (b) On the plot above, indicate which peaks derive from valence electrons, and then calculate the average valence electron energy (AVEE) for sulfur. (c) Calculate the effective number of electrons shielding the sulfur 3p electron from the nucleus, s, using the empirical formula IE = (1.3MJ/mol)[(Z – s)/n]2 How does (Z – s) compare with the “core charge” on sulfur? Explain why they are different. (d) What can you say numerically about the magnitude of the first ionization energy of the S- anion (also known as the “electron affinity” of the S atom)? Give your reasoning in two sentences or less.

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20.50