You are working in a laboratory that makes frequent use of a scanning tunneling microscope (STM) to study surfaces of materials. The current through the tip of an STM (see figure) is very sensitive to differences in the width of the gap between the tip and the sample surface. Assume the transmission coefficient for the electron falls off exponentially in this direction with a decay length of 0.100 nm, that is, with C = 10.0 nm 1 in Te-2CL, Your supervisor asks you to determine the ratio of the current when the STM tip is 0.498 nm above a surface feature (I₁) to the current when the tip is 0.526 nm above the surface (I2). 12
Electronic Transitions and Spectroscopy
The term “electronic” connotes electron, and the term “transition” implies transformation. In a molecule, the electrons move from a lower to a higher energy state due to excitation. The two energy states, the ground state and the excited state are the lowest and the highest energy states, respectively. An energy change is observed with this transition, which depicts the various data related to the molecule.
Photoelectron Spectroscopy
Photoelectron spectroscopy (PES) is a part of experimental chemistry. It is a technique used in laboratories that involves projecting intense beams of radiation on a sample element. In response, the element ejects electrons for which the relative energies are measured.
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