Larmor rotation
Larmor rotation
When magnetic-field components vertical to a velocity component of an electron exist, the electron undergoes a rotary motion vertical to the the magnetic-field components. This rotary motion is called “Larmor rotation.”
In a transmission electron microscope (TEM), when an electron transmitted through a specimen travels in the vertical direction (from above to below), the electron undergoes Lamor rotation due to the horizontal magnetic-field components of the magnetic-field lenses. Since the imaging system uses multi-stage magnetic-field lenses, the enlarged image of a specimen is formed onto the fluorescent screen with a certain rotation against the specimen. The rotation angle is determined by the accelerating voltage of the electron and the total ampere turns of the magnetic-field lenses.
In a transmission electron microscope (TEM), when an electron transmitted through a specimen travels in the vertical direction (from above to below), the electron undergoes Lamor rotation due to the horizontal magnetic-field components of the magnetic-field lenses. Since the imaging system uses multi-stage magnetic-field lenses, the enlarged image of a specimen is formed onto the fluorescent screen with a certain rotation against the specimen. The rotation angle is determined by the accelerating voltage of the electron and the total ampere turns of the magnetic-field lenses.
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