Square Nanometer [nm²]
A square nanometer (nm²) is a unit of area equal to a square with sides 1 nanometer long (1 nm = 1 billionth of a meter, or 10⁻⁹ m).
It’s used to measure extremely tiny areas, like the surface of molecules or nanomaterials.
1 nm² = 1 × 10⁻¹⁸ m².
Electron Cross Section
The electron cross section is a measure of the probability that an electron will interact with a target particle (like an atom or nucleus) during scattering or collision processes. It represents an effective area that quantifies the likelihood of interaction.
Typically measured in units called barns (1 barn = 10⁻²⁸ m²) or square meters.
Used in fields like nuclear physics, atomic physics, and materials science.
Cross sections vary depending on the energy of the electron and the nature of the target.
It helps scientists understand and predict how electrons scatter, absorb, or cause reactions at the microscopic level.