Chemistry High School

1. (30 points total) A monochromatized ESCA instrument (equipped with an electron flood gun for charge compensation) is used to acquire data on a sample consisting of a clean platinum (Pt) plate onto which a polymer, polyethylene imine), with the repeat unit structure below, is solvent- deposited: -[CH2CH2NH]n - The binding energy (BE) for carbon in-CH2-groups (referenced to the Fermi level) is 285.0 eV. The BE for the Pt 4F7/2 line (referenced to the Fermi level) is 70.3 eV. The BE for the nitrogen 1s line (imine group) (referenced to the Fermi level) is 399.4 eV. D) For the sample with the poly(ethylene imine) deposited and the electron flood gun switched ON, the C1s speak is seen at 278 eV. What binding energy will the imine N1s peak be seen at? (calculate): Binding Energy = E) In the high resolution carbon 1s spectrum, how many peaks can be readily resolved from the peak envelope seen? (circle one) 1 2 2 3 4

Answers

Answer 1

The only one peak can be seen in the high-resolution carbon 1s spectrum. Hence, the correct option is E) One peak can be readily resolved from the peak envelope seen.

D) The binding energy for the imine N1s peak is 514.1 eV.

E) One peak can be readily resolved from the peak envelope seen.

Explanation: When the electron flood gun is turned on, the excess energy given to electrons to neutralize the surface charge is absorbed by the sample which leads to inelastic scattering.

Thus, if the electron flood gun is turned on, then the binding energy of C1s would shift by 7 eV to lower energy and become 278 eV. So, the binding energy for the N1s peak of imine can be calculated as:

Binding Energy of N1s peak = (Measured binding energy of C1s peak) + (Binding energy difference of C1s and N1s) = 278 eV + (399.4 eV - 285.0 eV) = 514.4 eVHigh-resolution carbon 1s spectrum

The carbon atoms present in the carbon-carbon (C-C) single bond of poly(ethylene imine) have a binding energy of 285.0 eV.

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