Ion trap
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ion_trap".

Ion trap
Ion trap

An ion trap is a combination of electric or magnetic fields that captures ions in a region of a vacuum system or tube. The two most common types of ion traps are the Penning trap and the Paul trap (quadrupole ion trap).

Schematic diagram of ion trap mass spectrometer source
Schematic diagram of ion trap mass spectrometer source

An ion trap mass spectrometer may incorporate a Penning trap (Fourier transform ion cyclotron resonance)[1], Paul trap[2] or the Kingdon trap.[3] The Orbitrap, introduced in 2005, is based on the Kingdon trap[4]. Other types of mass spectrometers may also use a linear quadrupole ion trap as a selective mass filter.

In an electron gun (a device emitting high-speed electrons, such as those in CRTs), an ion trap may be implemented above the cathode (using an extra, positively-charged electrode between the cathode and the extraction electrode) to prevent its degradation by positive ions accelerated backward by the fields intended to pull electrons away from the cathode.

Ion traps were also used in early television receivers, prior to the introduction of aluminized CRT faces in approximately 1958. The ion trap must be delicately adjusted for maximum brightness.

See also

References

  1. ^ Blaum, Klaus (2006). "High-accuracy mass spectrometry with stored ions". Physics Reports 425 (1): 1-78. doi:10.1016/j.physrep.2005.10.011. 
  2. ^ Douglas, D.J.; Frank, AJ; Mao, DM (2005). "Linear ion traps in mass spectrometry". Mass Spectrometry Reviews 24 (1): 1-29. doi:10.1002/mas.20004. 
  3. ^ Kingdon KH (1923). "A Method for the Neutralization of Electron Space Charge by Positive Ionization at Very Low Gas Pressures". Physical Review 21: 408-418. doi:10.1103/PhysRev.21.408. 
  4. ^ Hu, QZ; Noll, RJ; Li, HY; Makarov, A; Hardman, M; Cooks, RG (2005). "The Orbitrap: a new mass spectrometer". Journal of Mass Spectrometry 40 (4): 430-443. doi:10.1002/jms.856. 

External links

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Mass spectrometry
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