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## Ion cyclotron resonance
## Additional recommended knowledge## Definition of the resonant frequencyAn ion in a static and uniform magnetic field will move in a circle due to the Lorentz force. The circular motion may be superimposed with a uniform axial motion, resulting in a helix, or with a uniform motion perpendicular to the field, e.g., in the presence of an electrical or gravitational field, resulting in a cycloid. The angular frequency (ω = 2π - .
where z is the algebric number of positive or negative charges of the ion, e is the elementary charge and m is the mass of the ion. The formula above means that an electric excitation signal having a frequency f will resonate with ions having a mass-to-charge ratio m/z given by: - .
## References**^**In SI units, the elementary charge*e*has the value 1.602×10^{-19}C, the mass of the ion*m*is often given in atomic mass unit or dalton 1 u = 1 Da ≈ 1.660538782(83) × 10^{−27}kg, the magnetic field*B*is measured in tesla, and the angular frequency ω is measured in radians per second.
## See alsoCategories: Condensed matter physics | Electric and magnetic fields in matter | Ion source |

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ion_cyclotron_resonance". A list of authors is available in Wikipedia. |