scanning tunneling microscopy (STM), Scanning tunneling spectroscopy (STS) and ultraviolet photoelectron spectroscopy (UPS) 1. Surface science experimental

scanning tunneling microscopy (STM), Scanning tunneling spectroscopy (STS) and ultraviolet photoelectron spectroscopy (UPS)

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1. Surface science experimental techniques. (a) (b) P With the help of sketches give a short description of the operation principles of the following experimental techniques: scanning tunnelling microscopy (STM), scanning tunnelling spectroscopy (STS), and ultraviolet photoelectron spectroscopy (UPS). For each technique mentioned above, describe the gathered information regarding the surface structure of the investigated sample. [1.5] With the help of examples, describe how the physical quantity measured in each experiment, e.g. current, relates to the electronic or lattice structure of the surface. [3] [3] Consider an experiment in which the surface of an intrinsic seminconductor is probed by UPS and in a separate experiment by STS. Describe the differences in the information obtained from the two techniques. ल [3] 1. Surface science experimental techniques. (a) (b) P With the help of sketches give a short description of the operation principles of the following experimental techniques: scanning tunnelling microscopy (STM), scanning tunnelling spectroscopy (STS), and ultraviolet photoelectron spectroscopy (UPS). For each technique mentioned above, describe the gathered information regarding the surface structure of the investigated sample. [1.5] With the help of examples, describe how the physical quantity measured in each experiment, e.g. current, relates to the electronic or lattice structure of the surface. [3] [3] Consider an experiment in which the surface of an intrinsic seminconductor is probed by UPS and in a separate experiment by STS. Describe the differences in the information obtained from the two techniques. ल [3]