# Ion cyclotron resonance

Ion cyclotron resonance

Ion cyclotron resonance is a phenomenon related to the movement of ions in a magnetic field. It is used for accelerating ions in a cyclotron, and for measuring the masses of an ionized analyte in mass spectrometry, particularly with Fourier transform ion cyclotron resonance mass spectrometers. It can also be used to follow the kinetics of chemical reactions in a dilute gas mixture, provided these involve charged species.

## Definition of the resonant frequency

An 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 f ) of this cyclotron motion for a given magnetic field strength B is given (in SI units[1]) by

$\omega=\frac{zeB}{m}$.

where z is the algebraic 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:

$\frac{m}{z}=\frac{eB}{2\pi f}$.

## References

1. ^ 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 teslas, and the angular frequency ω is measured in radians per second.

Wikimedia Foundation. 2010.

### Look at other dictionaries:

• ion cyclotron resonance — jonų ciklotroninis rezonansas statusas T sritis fizika atitikmenys: angl. ion cyclotron resonance vok. Ionenzyklotronresonanz, f rus. ионный циклотронный резонанс, m pranc. résonance cyclotron ionique, f …   Fizikos terminų žodynas

• Fourier transform ion cyclotron resonance — Infobox chemical analysis name = Fourier transform ion cyclotron resonance caption =A FTMS instrument at the Pacific Northwest National Laboratory, USA acronym = FTMS, FTICR classification =Mass spectrometry analytes = manufacturers = related =… …   Wikipedia

• Electron cyclotron resonance — is a phenomenon observed both in plasma physics and condensed matter physics. An electron 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,… …   Wikipedia

• Cyclotron — For other uses, see Cyclotron (disambiguation). A modern Cyclotron for radiation therapy …   Wikipedia

• résonance cyclotron ionique — jonų ciklotroninis rezonansas statusas T sritis fizika atitikmenys: angl. ion cyclotron resonance vok. Ionenzyklotronresonanz, f rus. ионный циклотронный резонанс, m pranc. résonance cyclotron ionique, f …   Fizikos terminų žodynas

• Ion trap — ). An ion trap mass spectrometer may incorporate a Penning trap (Fourier transform ion cyclotron resonance) [cite journal | title = High accuracy mass spectrometry with stored ions | author = Blaum, Klaus | journal = Physics Reports | volume =… …   Wikipedia

• Résonance cyclotron — La résonance cyclotron électronique est un phénomène observé aussi bien en physique des plasmas qu en physique de la matière condensée. Un électron dans un champ magnétique statique et uniforme se déplace sur un cercle en raison de la force de… …   Wikipédia en Français

• Ion source — An ion source is an electro magnetic device that is used to create charged particles. These are used primarily within mass spectrometers or particle accelerators.Mass spectrometry In mass spectrometry, an ion source is a piece of equipment used… …   Wikipedia

• Quadrupole ion trap — Scheme of a Quadrupole ion trap of classical setup with a particle of positive charge (dark red), surrounded by a cloud of similarly charged particles (light red). The electric field E (blue) is generated by a quadrupole of endcaps (a, positive)… …   Wikipedia

• Plasma-immersion ion implantation — (PIII) [cite book | title = Materials Science of Thin Films | author = Milton Ohring | publisher = Academic Press | year = 2002 | isbn = 0125249756 | url = http://books.google.com/books?id=SOt yFjV xwC pg=PA267… …   Wikipedia