All Flashcards
In a PES spectrum, what information do the X and Y axes provide?
X-axis (Binding Energy): Energy needed to remove an electron. Y-axis (Intensity): Number of electrons in that subshell.
What does the peak height on a PES spectrum indicate?
The number of electrons in that energy level (subshell).
What does the peak position on a PES spectrum indicate?
The energy level (binding energy) of the electron.
What is a photon?
A tiny packet of energy of light.
Define threshold frequency.
The minimum frequency of light required to eject electrons from a metal surface.
What is binding energy in PES?
The energy required to remove an electron from an atom or molecule.
Define frequency ().
The number of waves passing a point per second; higher frequency equals higher energy.
What is Photoelectron Spectroscopy (PES)?
A technique that uses the photoelectric effect to analyze electron energies in atoms, ions, and molecules.
What are the three main steps of Photoelectron Spectroscopy (PES)?
- Shine light on a sample. 2. Electrons are ejected if the light has enough energy. 3. Measure the kinetic energy of the ejected electrons.