(a) The following are scientific problems which can be investigated by applying an appropriate surface science technique

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A The Following Are Scientific Problems Which Can Be Investigated By Applying An Appropriate Surface Science Technique 1 (96.77 KiB) Viewed 68 times

(a) The following are scientific problems which can be investigated by applying an appropriate surface science technique. For each problem, which surface science technique is most appropriate to use, and why? (i) A single-crystal metal surface is known to reconstruct upon exposure to oxygen gas at elevated temperatures. How can the surface reconstruction be determined? (3 marks) (ii) We have attempted a new procedure to coat a piece of borosilicate glass with an ultrathin layer of a polymer. How can we determine whether our coating procedure has been successful? (3 marks) (iii) A single-crystal oxide surface dissociatively adsorbs water at defect sites on its surface, to form hydroxyls. The defect sites are randomly arranged on the surface at a low density (-1%). How can the coverage of hydroxyls on the oxide surface be determined? (2 marks) (iv) A small molecule adsorbs on a single crystal surface with a desorption temperature just below room temperature. How can we determine whether the molecule is physisorbed or chemisorbed? (2 marks)